41results about How to "Easy to expand applications" patented technology

The invention, which belongs to the power converter control field of the driving motor, relates to a method for controlling neutral point voltage balance of a three level converter, wherein the method is based on a voltage space vector pulse width modulation technology and is used for controlling a neutral point clamped three level inverter. The method comprises the following steps that: step one, an action time distribution factor of a redundant small vector is obtained; step two, an area where control on a neutral point potential balance can be realized by a nearest three vector (NTV) method is obtained; step three, an NTV action area in a mixed voltage space vector pulse width modulation method is obtained; step four, a switching condition of the mixed voltage space vector pulse width modulation method is designed; and step five, the mixed voltage space vector pulse width modulation method with a proportion of pm is realized. According to the invention, a redundant small vector distribution factor is employed to design a switching condition of a mixed voltage space vector pulse width modulation strategy; therefore, an essence of a space vector modulation method is embodied; themethod can be used flexibly and used variables are less, so that it is beneficial for analysis and development application.

The invention discloses a three-level PWM (Pulse-Width Modulation) rectifier direct power control method, which comprises the following steps of: deducing an instantaneous power control model of a rectifier by utilizing a high frequency mathematical model and an instantaneous power theory of the three-level rectifier; substituting basic vectors corresponding to 27 groups of switch statuses of a three-level converter into the instantaneous power control model, and carrying out normalization to obtain formulas of active power variation rate and reactive power variation rate under the action of the basic vectors; calculating the active power variation rate and the reactive power variation rate corresponding to each basic vector in a whole vector space, and classifying basic vectors according to the types of the vectors, the active and the reactive power variation trends and the variation rates; and quantizing the reactive power variation rate needed to be tracked into two levels, quantizing the active power variation rate into four levels, and building a switch list controlled by rectifier direct power. The method can realize network side unit power factors, quickly stabilize direct current bus voltage and balanced midpoint potential, and is more effective for fast tracking the instantaneous active power and reactive power.

The invention discloses a terminal connection feed-backward type rectangular waveguide-microstrip transition device, comprising a rectangular waveguide, a height reduction rectangular waveguide, a transition window, a microstrip line conduction band, a microstrip medium substrate, a microstrip plate large-area ground layer and a microstrip transmission line cavity block. The microstrip medium substrate consists of a waveguide side substrate, a connection section substrate and a transmission side substrate; the top of the microstrip medium substrate is provided with the microstrip line conduction band; the microstrip medium substrate and the microstrip line conduction band are combined into a microstrip probe plate; the bottom of the microstrip probe plate is provided with the microstrip plate large-area ground layer; one end of the microstrip probe plate is connected to a rectangular waveguide through the height reduction rectangular waveguide; and the top of the other end of the microstrip probe plate is provided with a microstrip transmission line cavity block. The terminal connection feed-backward type rectangular waveguide-microstrip transition device is small in volume, compact in structure and easy to implement. The length size of the slotting window in the transition section is inversely proportional to a central working frequency of the system and satisfies various working frequency bands of the W wave band.

The invention discloses a photoelectric induction-based air gesture identification method. The method comprises the following steps of collecting an air gesture image through photoelectric induction;processing and analyzing the gesture image to finish gesture identification; and outputting a corresponding operation indication to a terminal device. A photoelectric induction-based air gesture identification control apparatus comprises an image collection module, an image processing module, an MCU and an infrared light-emitting diode, wherein the output end of the image collection module is connected with the input end of the image processing module; and the output end of the image processing module is connected with the input end of the MCU. A non-contact man-machine interactive mode of identifying and controlling an application by an air gesture is realized; tedious configuration and complex processing during man-machine interaction are eliminated; external environmental factor interference is reduced; the detection sensitivity is reduced; the user experience is improved; and the practicality and reliability of air gesture identification and processing are enhanced. The method andthe apparatus are widely applied to the field of man-machine interaction.

The invention relates to the technical field of active noise control, particularly to an adaptive active noise control display system, so that problems that visual displaying of the existing adaptive active noise control technique can not be realized, people can not understand and master the technique conveniently, and people can not determine and sense the noise control effect conveniently are solved. The adaptive active noise control display system is composed of a display rack, a control unit, a primary sound source loudspeaker, a secondary sound source loudspeaker, an error microphone and an LCD touch screen. The control unit controls the primary sound source loudspeaker to send out single-frequency or composite-frequency noises by controlling the key of the LCD touch screen or dial switch selection, thereby forming a primary sound field; the error microphone obtains a noise signal of the primary sound field; the noise signal of the primary sound field and an error sound channel function obtained by identification are analyzed to obtain a secondary sound source signal; and the control unit controls the secondary sound source loudspeaker make sounds to realize adaptive active noise control so as to eliminate the secondary sound field noises. And changes of noises before and after active control implementation are compared visually by observing the touch screen.

The invention discloses a self-correction checking device and method applied to marketing and distribution through box meter relation maintenance. The device comprises a shell, a processor and a GPS module for positioning are arranged in the shell, and an infrared communication module used for reading electric meter event information, a laser scanning module used for scanning box meter identification codes, a USB interface used for data exchange with an external management system and a display screen used for information display are arranged on the front end face of the shell. The input end ofthe processor is connected with the signal output ends of the GPS module, the infrared communication module and the scanning box meter identification code, and the processor is used for correcting the collected identification code information, binding a transformer area box meter and carrying out electricity larceny analysis according to the collected electric meter event information. The outputend of the processor is respectively connected with the display screen and an alarm module arranged on the shell. According to the invention, self-correction check of marketing and distribution through box meter relation maintenance can be realized, and the field check efficiency of marketing and distribution data is improved.

The invention relates to a report generation method and device. The report generation method comprises the steps of displaying a preset page, wherein the preset page comprises a first area and a second area, and the first area comprises at least one report type option; according to selection operation on the report type option, generating a report to be edited of a corresponding type; displaying the report to be edited and a preset function button in the second area; according to operation on the function button, editing the content of the report to be edited and generating a user-defined report. By the adoption of the report generation device, a display interface is divided into a selection area and a design area, and is simple and easy to operate; a user can generate a user-defined report file including one or more reports through simple operation such as dragging and clicking the button and can set types, formats, contents, sizes, styles and positions of the reports, the contents of the reports are more abundant, chart types are more diverse, the flexibility is relatively high, and the report generation method and device are conductive to expanding applications.

The invention discloses a DBD (dielectric barrier discharge) high-frequency bipolar nanosecond pulse generator based on magnetic compression, which comprises a power supply system, a solid state switch system, a control circuit and a magnetic pulse compression system. According to the DBD high-frequency bipolar nanosecond pulse generator based on magnetic compression, actually, a saturable inductor is used to compress pulse voltage, the rising edge of voltage waves is thus improved, and in order to improve the working frequency of the generator, a full-bridge inverter circuit is used to generate bipolar pulses, and a magnetic core reset circuit can be saved. A test result shows that through the bipolar magnetic compression system, the nanosecond pulse voltage outputted at two ends of a load has the following parameters: adjustable amplitude between 5 to 13 kV, the rising edge around 100 ns, and the repeated frequency as high as several kHz.

The invention aims at problems existed in forsterite, and provides a preparation method of a zirconium oxide-forsterite composite material with high strength and density. Magnesite and a zirconium oxide are used as raw materials, a solid-phase reaction sintering process is used for preparing the zirconium oxide-forsterite composite material with high strength and density by one step, and the technical scheme mainly comprises pretreatment of magnesite, mixing of materials, moulding, and sintering. The raw material MgO has effects for stabilizing zirconium oxide, and the zirconium oxide materialshows optimum performance; introduced zirconium oxide improves strength and density of forsterite, process design is reasonable and flow is convenient, and the method benefits for industrialization and development and application to other fields.

The invention relates to a three-dimensional freezing printing method of ceramic components. The method comprises the following steps that (1) ceramic powder, silica sol, polyethylene glycol and polyvinyl alcohol are subjected to ball milling to obtain a ceramic slurry; (2) a printing cavity of a 3D printing device is cooled to minus 10 DEG C to minus 60 DEG C, and then the ceramic slurry is usedfor printing; the wet mud material extruded from nozzles is bonded to a printing base plate to form a first layer of mud material; printing is continuously conducted, the wet mud material extruded from the nozzles continuously form a second layer of mud material, a third layer of mud material.., and an Nth layer of mud material on the first layer of mud material; and the formed mud layers are gradually fused, and when printing is carried out to by 4-10 layers, the inner mud material layers and the interlayers are gradually frozen and solidified to obtain a green body; and (3) the green body isfreeze-dried and then heated and sintered to obtain the ceramic component. According to the printing method, the integrity of the printed ceramic can be realized, and the bonding strength between thelayers is improved.

The invention discloses a narrow pulse suppression and electric energy quality improvement method for a matrix converter. The method is characterized in that: the matrix converter adopts double-voltage modulation; and when control signals of six switches for line voltage synthesis have narrow pulses in a certain switching period, six groups of new modulation functions for switch control are reconstructed and calculated according to the positions of the narrow pulses. The new functions are characterized in that: the new functions comprise instantaneous output current detection information; one of the six switches is kept in an off state; and the modulation functions simultaneously meet input current and output voltage modulation requirements. On the premise of no increase of the switching loss and the number of commutation times of the matrix converter, the number of the narrow pulses is effectively decreased, and the input and output waveform quality of the matrix converter is improved; and the method is particularly suitable for middle and high power places in which commutation time is long.

The invention discloses a rotating machinery blade tip clearance and blade rotating speed comprehensive measuring system and method and an image processing program. The effect of measuring the blade tip clearance and the blade rotating speed by only using the high frequency image acquisition device can be achieved. The system comprises an image acquisition device, an image acquisition card and animage processing unit. The image acquisition device is used for acquiring the real-time image of the rotating blade and the case and transmitting the real-time image to the image acquisition card. Theimage acquisition card is used for converting the received signal into the digital signal and transmitting the digital signal to the image processing unit. The image processing unit is used for performing image processing and computing of the received image and also obtaining the blade tip clearance and the blade rotating speed of the measured rotating impeller. The measurement is accurate and the number of the sensor required for measurement is low so that the system and the method can be used for real-time measurement of the rotating machinery blade clearance and rotating speed and have wide application prospect.

The invention discloses a preparation method of a nucleolus targeted photo-thermal reagent based on perylene bisimide and an application thereof. The preparation method comprises the following steps: firstly, reacting liquid bromine with perylene anhydride to obtain bromine-substituted perylene bisimide; and then introducing substituent groups into an imide site and a bay site through a reaction between amino and acid anhydride and a nucleophilic substitution reaction between amino and bromine, so as to obtain the perylene bisimide-based nucleolus targeted photo-thermal reagent. The photo-thermal reagent designed and synthesized by the invention is a compound capable of generating strong specific binding with nucleic acid, the binding force enables the photo-thermal reagent to be rapidly taken by cells (within three minutes) and enriched to a nucleolus part with concentrated DNA and RNA, and the targeting effect on the nucleolus is superior to that of a commercial dye nucleolus green. The photothermal reagent designed and synthesized by the invention is good in water solubility, good in light, heat and chemical stability, high in absorbance in a near-infrared region, good in photothermal conversion efficiency and excellent in photothermal killing effect on tumor cells, and can realize photothermal therapy of cancer cells.

The embodiment of the invention provides a textile QR code identifier and a production method thereof. The textile QR code identifier comprises a dark-color module and a light-color module formed through weaving, wherein the dark-color module is formed by weaving dark-color threads in the same color as the dark-color module; the light-color module is formed by weaving light-color threads in the same color as the light-color module; and the dark-color module and the light-color module are distinguished according to a preset grayscale threshold. Through the textile QR code identifier and the production method thereof in the embodiment, since the dark-color module and the light-color module of the textile QR code identifier are formed through the textile technology, compared with a QR code obtained through a printing mode traditionally, the textile QR code identifier has the remarkable advantages of wear resistance, washing resistance and the like, the damage rate of the QR code is effectively lowered, permanency is improved, identification demands in different scenes are met, and extended application of the QR code is benefited.

The invention relates to a high-performance-fabric printing method, and belongs to the technical field of spinning printing and dyeing. According to the high-performance-fabric printing method, a high-performance fabric is chemically pretreated before printing, treating fluid adopts silicic acid gel generated through sodium silicate hydrolysis, N,N-dimethylacetamide is richened in the silicic acidgel, and meanwhile the silicic acid gel is attached to the fiber surface of the fabric. Under the condition of 50 DEG C to 70 DEG C, the N,N-dimethylacetamide opens part of hydrogen bonds between meta-position aramid fiber surface macromolecules, the surface roughness and the porosity of fibers are improved, then under an effect of sodium hydroxide, the silicic acid gel attached on the surface ofthe high-performance fabric is dissolved, the N,N-dimethylacetamide is released, and further acts on the fiber surface in the heat preservation process, and the structure of the fiber surface is further loosened. It is achieved that dye is transferred into the fibers through the common synergistic effect of baking and steaming on the basis of the structure. Therefore, according to the technical scheme, the printing efficiency of the high-performance fabric is improved, and the high-performance fabric can be expanded and applied.

The invention belongs to the field of preparation of retainers, and particularly relates to a forming method of a small-size polyimide self-lubricating composite retainer material. The composite retainer material is mainly formed by at least carrying out primary pressing, primary sintering, secondary pressing, secondary sintering and final pressing on fusible polyimide molding powder. A special mold for forming the small-size retainer material is used in the steps of primary pressing, primary sintering, secondary pressing, secondary sintering and final pressing, and the special mold comprises a mold body, and more than two cavities for pressing to form the composite retainer material are arranged on the mold body in parallel. According to the multi-time pressing forming process which is at least subjected to three times of pressing and two times of sintering, through the advantage of accumulated consistency of the special mold, the consistency of a plurality of formed retainer materials is greatly improved due to the fact that the same forming operation is carried out; and meanwhile, the cost is further reduced, and the production efficiency is further improved.

The invention discloses a secret key storage method of a wireless fixed telephone. The secret key storage method of the wireless fixed telephone includes the following steps: (1) selecting a first secret key which is used for telephone card authentication and a first encryption algorithm which is used for the telephone card authentication, wherein the telephone card authentication is authentication between a telephone of the wireless telephone and a subscriber identity module (SIM) card, (2) encrypting and writing a code of the first encryption algorithm and the first secret key in a flash by adopting a second encryption algorithm and a second secret key. The invention further discloses a telephone card authentication method of the wireless fixed telephone. Due to the fact that the secret key storage method and the telephone card authentication method of the wireless fixed telephone does not need to be provided with a write-only chip, the secret key storage method and the telephone card authentication method of the wireless fixed telephone solves the problem that the existing wireless fixed telephone needs to be provided with the write-only chip, wherein the write-only chip supports a 3 data encryption standard (DES) algorithm and all operations relative to the secret keys are finished in the chip. The secret key storage method and the telephone card authentication method of the wireless fixed telephone has the advantages of being capable of guaranteeing safety of the secret keys and simultaneously reducing cost of the wireless fixed telephone, and beneficial for development and application of the wireless telephone.

The invention provides a textile wine ribbon which comprises a telescopic belt, the two sides of the telescopic belt are connected with one end of a left textile ribbon and one end of a right textile ribbon, the left textile ribbon and the right textile ribbon are the same in structure, and patterns are woven on the left textile ribbon and the right textile ribbon through the jacquard technology, and a male buckle and a female buckle are installed on the two sides of the telescopic belt respectively. The wine ribbon can be directly fixed to a wine bottle through the male buckle and the female buckle, operation is easy, and fixation is firm; the deep-color module and the light-color module of the textile wine ribbon are formed through the textile technology, high efficiency and low consumption are achieved, compared with a traditional wine ribbon obtained in a passing mode, the textile wine ribbon has the advantages that the front and back same effects are achieved, the visual aesthetic feeling is strong and remarkable, damage to the textile wine ribbon is effectively reduced, permanency is improved, identification requirements of different scenes are met, and expansion and application of the textile wine ribbon are facilitated.

The invention discloses an RFID tag with an external binding area. The invention relates to the technical field of RFID tags, in particular to an RFID tag with an external binding area. The RFID tag with the external binding area is space-saving, convenient to process and low in cost and comprises a tag antenna and a chip, wherein the tag antenna comprises a base material, a front metal antenna, aback metal antenna and two gap bridges; the front metal antenna is arranged on the front surface of the base material and comprises a metal coil; the back metal antenna is arranged on the back surface of the base material and comprises a linear transmission line; one end of the transmission line is connected to the interior of the metal coil through a gap bridge; and the other end of the transmission line is connected to the exterior of the metal coil through the other gap bridge; and the binding area of the chip is arranged on the outer side of the tag antenna. The antenna appearance and thegap bridge appearance can be flexibly adjusted and designed, so that the earlier-stage design is more convenient, and the use scene is wider.

The invention discloses a method for solving conflicts under multiple conditions of voice retrieval. The method comprises the following steps: inputting query voice; recognizing user voice; extracting entity keywords; filling a template word slot; performing multi-condition filling treatment; matching an optimal expression; sorting query results; outputting ranking result. According to the method and the device, the query content information related to the query problem information in the knowledge graph is conveniently and completely completed into the entity keyword filling template according to the query instruction, so that the problem information of the user is quickly queried, and by performing multi-condition filling processing on the keyword filling template, the retrieval contents of multiple different conditions corresponding to the keyword filling template in the knowledge graph can be substituted into the corresponding filling templates respectively, result information can be conveniently inquired according to different retrieval conditions, conflicts under multiple conditions of voice retrieval are solved, and the use experience of a user in the voice retrieval process is improved.

The invention belongs to the technical field of free bending for pipes, and particularly relates to a combined type multipoint-distributed pressing device and a free bending forming method for a pipe. In the pressing device of the technical scheme, a plurality of pressing mechanisms are cooperated, multipoint-distributed pressing for the to-be-formed pipe can be realized, the pressing mechanisms are independent of one another, and the to-be-formed pipe can be reliably pressed on the premise that normal propelling of a propelling device is not interfered, so that reworking and scrapping caused by axial instability and circumferential abnormal rotation of the pipe component are avoided, the forming capacity of three-dimensional free bending equipment is remarkably improved, and the forming efficiency of the three-dimensional free bending equipment is remarkably increased.