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4930results about How to "Fix stability issues" patented technology

Regional public opinion monitoring and decision-making auxiliary system and method based on big data

A regional public opinion monitoring and decision-making auxiliary system based on big data comprises an information acquisition and storage module, a data pre-processing module, a big data public opinion analysis module, a public opinion monitoring, early warning and decision-making auxiliary module and a background management module, wherein the information acquisition and storage module is used for carrying out structuralized storage management on acquired public opinion source information to form a regional big data public opinion knowledge base which is updated in real time; the data pre-processing module is used for pre-processing data in the regional big data public opinion knowledge base to form a complete and ordered data set; the big data public opinion analysis module is used for carrying out public opinion analysis and tendency prediction on hot topics with appointed conditions and the like to obtain a public opinion analysis and tendency prediction result; the public opinion monitoring, early warning and decision-making auxiliary module is used for carrying out real-time monitoring and tracking, management and persuasion on customized public opinions dug and analyzed by sensitive word pairs in a pre-defined sensitive word bank, and announcing the customized public opinions to a decision maker in manners of in-station messages, short messages and mails; and the background management module is used for carrying out public opinion information classification management, user and authority management, keyword management, acquisition management, content management, special topic management and analysis report management.
Owner:WUHAN TIPDM INTELLIGENT TECH

Graphene/carbon black thermoplastic resin master batch with high dispersibility and preparation method thereof

The invention discloses a graphene/carbon black thermoplastic resin master batch with high dispersibility and a preparation method thereof. The graphene/carbon black compound in the master batch is formed in an electrostatic self-assembly manner, and comprises 10-50% of graphene, 5-20% of carbon black, 0.5-10% of surfactant, 10-65% of carrier resin and 2-10% of assistant. The preparation method comprises the following steps: (1) compounding and dispersing graphene by adopting the surfactant to control the positive electricity of the graphene surface; (2) forming a stable graphene/carbon black compound from the modified graphene and carbon black with positive electricity through electrostatic incorporation in a self-assembly manner; (3) preparing the graphene/carbon black thermoplastic resin master batch with high dispersibility by matching with a solution blended process, a melt-blending method and an in-situ polymerization method; (4) adding the assistant to extrude and pelletize, so as to prepare the graphene/carbon black/thermoplastic resin master batch particles after processing the master batch. By adopting the obtained master batch, the problems of difficult charging of graphene powder, uneven dispersion, dust pollution, unstable product performance and the like are solved.
Owner:XIAMEN KNANO GRAPHENE TECH CORP

Rotary knocking gas turbine

The invention discloses a rotary knocking gas turbine. The rotary knocking gas turbine comprises a gas inlet passage, a diffusion section and a gas storage chamber which are connected in sequence from left to right, wherein a gas compressor is arranged at the downstream of the gas inlet passage; a rotary knocking combustion chamber is positioned at the right end of the gas storage chamber, the right end of the rotary knocking combustion chamber is connected with a mixing chamber, a turbine and an exhaust pipe in sequence, a plurality of nozzles are annularly arranged on the left end face of the rotary knocking combustion chamber at equal intervals, and six ignition plugs are uniformly arranged on the circumference of the rotary knocking combustion chamber; an air passage and a combustion passage are arranged on each nozzle, the gas storage chamber is communicated with the rotary knocking combustion chamber through a gas supply passage and the air passages of the nozzles, and the mixing chamber is communicated with the gas storage chamber through a gas escape bypass; a rotor is arranged between the gas compressor and the turbine, the gas compressor of a rotating component of the gas turbine and the turbine are connected with a casing of a static bearing component of the gas turbine through two bearings, and one end of the rotor is led out from the gas exhaust pipe. When the rotary knocking gas turbine is used, the leading-out end of the rotor is connected with a generator assembly through a speed changer.
Owner:XIAN THERMAL POWER RES INST CO LTD

Tunnel convergence displacement and arch crown settlement measuring device and measuring method

The invention provides a tunnel convergence displacement and arch crown settlement measuring device and measuring method. The measuring device is mounted on a tunnel wall and comprises an alignment device fixedly mounted on the tunnel wall, a laser distance measuring sensor mounted on the alignment device and a reflector mounted on a measuring point on the tunnel wall. The alignment device comprises a base, a ball socket is arranged in the base and is in spherical fit with a ball head rotor; the ball head rotor is fixedly connected with the laser distance measuring sensor; a locking device is arranged between the ball socket and the ball head rotor. The base is fixedly mounted on the tunnel wall through an expansion screw; the thread at one end part of the expansion screw is shorter than a threaded hole in the base of the alignment device. The measuring device further comprises an external triggering line and an external triggering button which are connected with the laser distance measuring sensor. Only one measuring device is needed to finish the convergence displacement and arch crown settlement measurement of an entire tunnel; the measurement result is accurate; the requirements of multiple measuring lines, high frequency and big total quantity of tunnel convergence monitoring are met.
Owner:TONGJI UNIV +1

Self-adaption zero-frequency compensation circuit in low-voltage difference linear voltage regulator

The invention relates to a self-adaption zero-frequency compensation circuit in a low-voltage difference linear voltage regulator. The output end of a transconductance amplifier is connected with a voltage regulation pipe by a voltage bumper, a current detection circuit is connected with the voltage bumper and the common end of the voltage regulation pipe, and the other end is connected with a variable-resistance circuit connected with the compensation end of the transconductance amplifier. In the invention, when a load is higher and current is lower, the current detection circuit can detect the load and the current and the load and the current act on the variable-resistance circuit at the moment to ensure that the resistance is enlarged, and the zero position is also relatively lower; on the contrary, when the load is reduced and the current is enlarged, the resistance value of the variable-resistance circuit is reduced, and the zero position is higher. Therefore, the self-adaption zero can change along with the change of a pole so that the compensation circuit takes the effect of compensation and effectively ensures the stable state of system operation. The compensation circuit successfully solves the problem of poor stability of a low-voltage difference linear voltage regulator so that a load capacitance equivalent series resistance is not really important to the influence on system stability, transient response and ripple waves.
Owner:江西芯世达微电子有限公司

Active damping control method of lcl filter controllable rectification with current feedback on converter side

The invention relates to a LCL (Lower Control Unit) filtering controlled rectifying active damping control method of electric currents on a feedback variable current side, belonging to an active rectifying method of power electronics. The method comprises the following steps: a direct current voltage control unit is used for finishing the control on a direct current voltage and producing d-shaft active currents of an electric current control unit; a q-shaft current given is used for controlling reactive components of a rectifier; a soft phase locking unit is used for locking a power grid voltage phase position and realizing the synchronous rotational transformation of the power-grid voltage and sampling currents on the variable current side; the current given and a sampling actual value are fed into the electric current control unit; the output quantity of the electric current control unit is accumulated with the electric current on the variable current side which is fed back by usinga first-order high-pass filter to generate the given quantity of a voltage space vector unit; and finally, the voltage space vector unit generates six PWM (Pulse-Width Modulation) signals to finish the control on the rectifier. The method solves the stability problem of a LCL (Low Control Unit) filtering voltage type controlled rectifier and realizes the control of the rectifier on direct-currentvoltages and currents on line side under the condition that the electric current or voltage detection of a capacitor branch is not needed.
Owner:CHINA UNIV OF MINING & TECH +1

Solder joint type detection method and apparatus based on image identification

InactiveCN106530284ASolve the trouble of plate makingSolve the accuracy problemImage enhancementImage analysisJoints typesSoldering
The invention discloses a solder joint type detection method and apparatus based on image identification, and relates to the technical field of automatic optical detection. The solder joint type detection method based on image identification includes the steps: based on the obtained soldering tin images of at least two types of solder joints, establishing a training sample set; based on the training samples in the training sample set, training a pre-constructed convolution neural network; and inputting soldering tin images to be identified into the pre-constructed convolution neural network which completes the training, and identifying the types of solder joints in the soldering tin images. The technical scheme of the solder joint type detection method and apparatus based on image identification can utilize the convolution neural network to identify the soldering tin images, thus solving the problem that a traditional soldering tin defect detection method has trouble in plate making and is low in precision and stability, and can simply and quickly identify the welding sport type so as to realize accurate detection of defects of soldering tin by inputting the soldering tin images into the convolution neural network which completes the training.
Owner:GUANGZHOU SHIYUAN ELECTRONICS CO LTD

Small-target surface vertical target dispersion photoelectric measurement device

InactiveCN101922895ARealize non-contact accurate measurementFix stability issuesTarget detectorsTarget surfaceEngineering
The invention relates to a small-target surface vertical target dispersion photoelectric measurement device. The traditional contact measurement method has the problems that the labor intensity is high, the measuring results are greatly influenced by manual work, and particularly repeated holes cannot be identified and the measuring results cannot be provided in real time. A laser light source assembly is arranged symmetrically on the lateral surface of a linear array CCD camera, an emergent main axis of the laser light source assembly is coplanar with a main axis of the linear array CCD camera, and an original-direction reflecting film is opposite to the linear array CCD camera and vertical to a light curtain sent by the laser light source assembly. The device adopts an integrated structural design, forms the light curtain converged relative to the CCD camera by matching the laser assembly of a small-power semiconductor laser and the low-cost original-direction reflecting film, reliably acquires the information of positions where bullets pass through the light curtain, effectively solves the problems of unstability and low sensitivity of light used indoors during a CCD convergence test, and has the advantages of convenient installation and debugging, simple structure, and high safety of personnel and equipment.
Owner:XIAN TECHNOLOGICAL UNIV

High-voltage lithium cobalt oxide cathode material for lithium-ion battery and preparation method of high-voltage lithium cobalt oxide cathode material

The invention discloses a high-voltage lithium cobalt oxide cathode material for a lithium-ion battery and a preparation method of the high-voltage lithium cobalt oxide cathode material. The high-voltage lithium cobalt oxide cathode material is prepared from a doped lithium cobalt oxide matrix and a coating on the surface of the doped lithium cobalt oxide matrix, wherein a general formula of the doped lithium cobalt oxide matrix is Li<x>Co<1-y>M<y>O<2-z>N<z>; the general formula of the coating is LiNi<x'>Co<y'>Al<z'>O<2>; and the preparation method comprises the following steps: firstly, obtaining the lithium cobalt oxide matrix Li<x>Co<1-y>M<y>O<2-z>N<z> through once sintering; secondly, preparing a lithium cobalt oxide cathode material precursor coated with Ni<x'>Co<y'>Al<z'>(OH)<2> on the surface by liquid-phase co-precipitation reaction; and finally obtaining the high-voltage lithium cobalt oxide cathode material through twice sintering. The high-voltage lithium cobalt oxide cathode material prepared by the method is good in processability and high in compaction density, has relatively high specific capacity and good cycle performance in a high-voltage state, and can be stably circulated at high voltage of 3.0V to 4.5V.
Owner:HUNAN CHANGYUAN LICO CO LTD +1

Fiber mesh tape-wound and reinforced composite pipe, preparation process and device

The invention relates to a fiber mesh tape-wound and reinforced composite pipe, a preparation process and a device, belonging to the technical field of forming processes of composite pipes. The composite pipe comprises an inner-layer core pipe and a post-coated layer, as well as a fiber mesh tape arranged between two layers, wherein the inner-layer core pipe is extruded by a core pipe extruding machine, the adhesive resin fiber mesh tape is heated through a post-heating box, and the composite pipe is finally obtained by traction through a post-traction machine, sizing through a vacuum spraying and sizing box and the like. According to the composite pipe disclosed by the invention, the technology is adopted, the preparation process is simple, the existing tape plastic covering treatment process and the composite pipe forming process are combined into a whole, the number of workers for production is reduced, and the degree of automation is improved; furthermore, the used device is a conventional device, and the cost is reduced; and in addition, adhesive resin is firstly coated on the outer surface of the core pipe, and the plain woven fiber mesh tape is further wounded, so that the interface problem in the pipe is effectively solved, the mechanical properties of the pipe are upgraded and the stability of the pipe during long-term use is also improved.
Owner:ZHEJIANG WEIXING NEW BUILDING MATERIALS CO LTD
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