199results about How to "Shielding effect" patented technology

A thermally enhanced semiconductor package with EMI (electric and magnetic interference) shielding is provided in which a chip is mounted on and electrically connected to a surface of a substrate, and a thermally conductive member is stacked on the chip and electrically coupled to the surface of the substrate by bonding wires. An encapsulant is formed and encapsulates the chip, thermally conductive member, and bonding wires. A plurality of solder balls are implanted on an opposite surface of the substrate. The thermally conductive member is grounded via the bonding wires, substrate, and solder balls, and provides an EMI shielding effect for the chip to protect the chip against external electric and magnetic interference. The thermally conductive member has a coefficient of thermal expansion similar to that of the chip, and reduces thermal stress exerted on the chip and enhances mechanical strength of the chip to thereby prevent chip cracks.

The invention discloses a pixel unit, an array substrate, a liquid crystal panel, a display device and manufacturing methods thereof, relating to the technical field of liquid crystal display and aiming to improve a pixel aperture opening ratio, reduce the power consumption and improve the display effect. The pixel unit comprises a thin film transistor, a pixel electrode and a common electrode; the thin film transistor comprises a grid electrode, a grid insulating layer arranged on the grid electrode, an active layer arranged on the grid insulating layer, a source electrode and a drain electrode arranged on the active layer, and a passivation layer arranged on the source electrode and the drain electrode, wherein the common electrode is directly arranged on the passivation layer; and the pixel electrode is arranged below the passivation layer and is connected with the drain electrode of the thin film transistor. According to the array substrate, the liquid crystal panel, the display device and the manufacturing methods thereof, a visual angle can be improved, the power consumption is reduced, the aperture opening ratio is improved and further the display quality can be improved. The pixel unit, the array substrate, the liquid crystal panel and the display device can be used for liquid crystal display.

The invention discloses a binocular vision sensor on-site calibration method and a binocular vision sensor on-site calibration device in complicated environment. A sawtooth target capable of moving freely is cooperated with a linear laser having a wavelength corresponding to that of an optical filter to complete on-site rapid calibration. According to light strip information irradiated on the target, an image coordinate of a characteristic break point formed by a light strip and the sawtooth target is determined. Based on cross-ratio invariability, the coordinates of all of the break points in a target coordinate system are determined, and by combining with internal parameters of video cameras, the three-dimensional coordinates of all of the target characteristic points in the coordinate systems of the video cameras are calculated, and therefore an external parameter initial value between the two video cameras is calculated. By an integral non-linear optimization, the exact solution of the external parameter between the two video cameras is acquired. An important practical application value is provided for solving a problem of multi-vision sensor global calibration in the complicated environment.

The invention relates to a tobacco maturity detection method and device. The tobacco maturity detection method comprises the steps of: acquiring an image of tobacco to be detected by an image acquiring unit, processing the image to establish or convert into an image with an HSV (Hue Saturation Value) color mode, obtaining an H color component value and an S color component value of the image; andfiguring the maturity grade MD of the tobacco to be detected according to a given mathematical model. The tobacco maturity detection method and device are used for judging the maturity of the tobaccothrough the acquired tobacco image, and have the advantage of field rapid, site and living nondestructive detection to ensure visual and quantitative judgment of the maturity of the tobacco and strong operability, and are beneficial to proper harvesting and improving of homogeneity and tobacco quality of initially baked tobacco. In the method, model parameters are judged by using the H color component value and the S color component value in an image HSV color model without the V color component value, therefore, the influence of the value of the image to the establishment of the model is eliminated.

The invention discloses a method for mapping a mobile virtual network based on clustering. The method for mapping the mobile virtual network based on the clustering aims to improve the mapping success rate from a virtual network to a mobile physical network and virtual network revenue and to reduce mapping overhead. The method for mapping the mobile virtual network based on the clustering takes the physical network clustering as a basis and solves the problems that nodes and links in the process of virtual network mapping and in the process of resource allocation are poor in coordination, and algorithm performance is poor when virtual network topology is sparse in a mobile network environment. The method for mapping the mobile virtual network based on the clustering comprises the following steps: according to the displacement law of the nodes, predicting stability of the links among the nodes, clustering the physical network accordingly, and dividing the virtual network mapping into an inter-cluster mapping mode and an inside-cluster mapping mode. According to the method for mapping the mobile virtual network based on the clustering, due to the fact that a clustering method based on node prediction and the inter-cluster and the inside-cluster mapping modes based on the clustering are introduced, the virtual network mapping can achieve efficient and high success rate of request for the virtual network in the mobile network environment as well.

This invention relates to a data process system and a method based on a multiplayer architecture. The data process system includes several background service subsystems and a customer end and each subsystem includes applied server and database server connected with the server, data forward subsystem connecting the background subsystem and the customer end, matching the customer end with the applied server corresponding to the background service subsystem to set up a data interaction channel. The method includes: the customer end sends a request message to a first end applied router connected with it, the said request message includes data attribute and data. The router selects a coherent end applied router based on the data attribute and route information and to forward it to a background service subsystem or select it directly and determine the forward direction.

A balanced transmission cable connector with improved high speed signal transmission characteristics is realized by directly connecting a balanced transmission cable to a plug structure. The plug structure includes a block unit, a ground contact, and adjacent pairs of a first signal contact and a second signal contact. The ground contact and the adjacent pairs of the first signal contact and the second signal contact are aligned in an alignment direction with respect to one another and are held by the block unit. The ground contact is disposed in between the adjacent pairs of the first signal contact and the second signal contact. The first signal contact includes a first signal wire connecting portion to which a first signal wire of the balanced transmission cable is connected, and the second signal contact includes a second signal wire connecting portion to which a second signal wire of the balanced transmission cable is connected. The ground contact includes a drain wire connecting portion to which a ground wire of the balanced transmission cable is connected.

The invention discloses a transfer tube structure for ion mobility spectrometers, comprising electrical pole pieces which are arranged at interval and an insulated portion, wherein, the electrical pole pieces are netted sheet metals with radians and tapers. In addition, the radian or taper portion of the electrical pole piece is provided with a mesh with higher transparency. Because of the above structure of the invention, an electric field which has evener focusing center on the periphery is to be formed on the transfer district portion, because of the toroidal structure of the electrode periphery, the influence of the extraneous electric field to the transfer electric field can be screened. Because the electrode is netted and has a circular hole in the middle, which focus and gather the ions which are not moved at the axial center as much as possible, and the ions which move toward the direction of axial center can be completely and transparently pass by.

The invention discloses a three-frequency-range common-caliber active navigation antenna, for solving the problems of not wide enough work frequency band of a conventional navigation antenna, low radiation efficiency and low elevation angle gain of a directional diagram. The three-frequency-range common-caliber active navigation antenna comprises a common-caliber antenna unit (1), a filter (2), a low-noise amplifier (3) and a back cavity (4). The common-caliber antenna unit (1) comprises a high-frequency radiator, an intermediate frequency radiator and a low frequency radiator, the three radiators are successively laminated from top to bottom, and the high frequency radiator and the low frequency radiator employ capacitance coupling feed and introduce parasitic patches; the filter (2) and the low-noise amplifier (3) are disposed below the common-caliber antenna unit (1) and are installed in the cavity of the back cavity (4); and the common-caliber antenna unit (1), the filter (2) and the low-noise amplifier (3) are successively connected. The three-frequency-range common-caliber active navigation antenna can realize multiplexing of antennas of three system frequency ranges and also has the advantages of wide work frequency band and good radiation characteristic, thereby being applied to reception of signals of a satellite navigation system.

The invention discloses a Faraday cup sensing device used in an electron beam processing beam quality test. The Faraday cup sensing device comprises: a Faraday cup, an aluminum shell and a signal switching and amplification circuit. The Faraday cup and the signal switching and amplification circuit are arranged in the aluminum shell. The signal switching and amplification circuit is connected with an acquisition card of an industrial personal computer which is out of a vacuum chamber of an electron beam quality test system. Electron beam of the electron beam quality test system is collected by the Faraday cup and is flowed into the signal switching and amplification circuit through a cable. A weak current signal is processed by the signal switching and amplification circuit, then is converted into a digital signal by the acquisition card and is stored in the industrial personal computer. The Faraday cup comprises two electron beam aperture collection electrodes and one electron beam seam collection electrode. The aluminum shell comprises: an aluminum alloy shell and an aluminum alloy cover. By using the device, collection efficiency of the electron beam can be raised; multiple vacuum-pumping processes can be avoided. Amplifying the signal can obviously raise a signal to noise ratio.

The embodiment of the invention provides a service processing method and device. The method comprises the steps of obtaining a service operation request; wherein the service operation request comprises a service field; determining a target operation database according to the service field, and obtaining a plurality of micro-service instances connected with the target operation database, determining a target micro-service instance from the plurality of micro-service instances, and sending the service operation request to the target micro-service instance, so that the target micro-service instance executes corresponding operation on the target operation database according to the service operation request to generate a processing result; and receiving a processing result returned by the target micro-service instance, realizing decoupling of the service logic code and the database operation code, shielding the influence of the database operation code on the service logic code to a great extent, and reducing the redundancy of the service logic code.

The invention discloses a multilayer composite membrane passivation structure of a table top high-power semiconductor device. The multilayer composite membrane passivation structure comprises P-type boron junction areas and an N-type phosphorus junction area, the upper end and the lower end of the N-type phosphorus junction area are provided with the P-type phosphorus areas respectively, and an alpha-polycrystalline silicon layer, a semi-insulating polycrystalline silicon thin membrane, a low-temperature heat oxidation layer, a high-temperature Si3N4 thin membrane, a negative charge glass passivation layer and a low-temperature heat oxidation layer are sequentially arranged on the surface of a PN junction of a table top of the table top high-power semiconductor device from inside to outside. A manufacturing technology of the multilayer composite membrane passivation structure of the table top high-power semiconductor device includes the following steps: a, depositing the alpha-polycrystalline silicon, b, depositing semi-insulating polycrystalline silicon, c, depositing the low-temperature heat oxidation layer, d, depositing Si3N4, e, conducting passivation on glass, and f, depositing the low-temperature heat oxidation layer in the outmost layer. The multilayer composite membrane passivation structure and the manufacturing technology have the advantages that the alpha-polycrystalline silicon layer is deposited, so that crystal lattice adaptation can be achieved, damage to crystal lattices of a silicon wafer in a groove can be repaired, leaked currents in the surfaces of junctions are reduced, and the stability and the reliability of the device at the high temperature are improved.

An electrical connector provided in the present invention comprises a circuit board and a connecting wire member. The circuit board includes an upper circuit layer, a lower circuit layer, and a shielding layer. The connecting wire member includes a plurality of upper wires and a plurality of lower wires. The upper circuit layer has an upper concave portion made by removing circuit, and the lower circuit layer has a lower concave portion made by removing circuit. The upper wire set is disposed in the upper concave portion, and the lower wire set is disposed in the lower concave portion. Thus, the shielding between the upper wire set and the lower wire set is achieved, and the assembling and processing of wires and circuit layer is easier.

The invention provides a double-graphene-layer tunneling field effect transistor. A bottom gate dielectric layer is located on a bottom gate electrode. A double-graphene-layer active area is located on the bottom gate dielectric layer. A metal source electrode and a metal drain electrode are located at the two ends of the double-graphene-layer active area respectively and respectively cover a part of the double-graphene-layer active area. The metal source electrode and the metal drain electrode are made of different materials. For an n-type device, the work function of the metal source electrode is larger, the graphene in contact with the metal source electrode is in p-type doping, the work function of the metal drain electrode is small, and the graphene in contact with the metal drain electrode is in n-type doping. The electrodes of a p-type device are opposite to those of the n-type devices. The metal source electrode, the metal drain electrode and the graphene between the metal source electrode and the metal drain electrode are covered with a top gate dielectric layer. A top gate electrode is located on the top gate dielectric layer and overlaps the metal source electrode and the metal drain electrode. The manufacturing technology of the double-graphene-layer tunneling field effect transistor is simple. Compared with a traditional double-graphene-layer field effect transistor, the metal source electrode and the metal drain electrode of the double-graphene-layer tunneling field effect transistor are completed independently.

The invention relates to a device and method for testing medium material radiation induction conductivity for a satellite, and belongs to the field of testing. The device and method for testing the medium material radiation induction conductivity for the satellite is applicable to a test on thicker medium material radiation induction conductivity in an electrification effect evaluation inside the satellite. The device comprises a shielding box body, a 60Co irradiation source, a vacuum-pumping system, an upper electrode plate, a lower electrode plate, a sample table, an electrometer, a stabilized voltage source, a titanium window and a vacuum box. The method comprises the steps of utilizing the 60Co irradiation source to generate gamma ray irradiation medium materials, meanwhile utilizing the stabilized voltage source to exert voltage on electrodes on the medium materials, testing a leakage current of the lower electrode plate through the electrometer, obtaining a voltage value V and a current value I of the surface of the medium materials, and further calculating to obtain radiation induction conductivity of the medium materials. The device and method for testing the medium material radiation induction conductivity for the satellite is applicable to the test on the thicker medium material radiation induction conductivity in the electrification effect evaluation inside the satellite.

The invention discloses a multi-temperature zone calibration method based on an internal hollow type temperature control member. A multi-segment broken line relationship of temperatures varying along with the light intensity ratio of anti-Stokes to Stokes is obtained by utilizing a segmentation calibration manner while adopting an internal hollow type copper cylinder as the main body of a temperature control system, so that a temperature calibration curve infinitely approaches an index changing curve of the light intensity ratio of anti-Stokes to Stokes and the temperature. Under the precondition that the method does not influence the system performance, the temperature measurement accuracy of a system is further improved, the applicable temperature measurement range of the system is extended, and the defects and disadvantages of an existing temperature calibration manner are better overcome.

The invention discloses an online statistical analysis technique for generator set primary frequency modulation performance abnormity. The method comprises the following steps: selecting typical primary frequency modulation events beneficial for improving precision through generator PMU measured data obtained online, calculating primary frequency modulation contribution rate of a corresponding set, calculating actually measured average speed change rate by adopting an integral algorithm, screening out reasonable primary frequency modulation performance evaluation results by using a reasonable data range and normal distribution variance, and shielding the influences of disturbance and secondary frequency modulation on primary frequency modulation performance evaluation; and then giving an alarm for primary frequency modulation abnormity of the set according to the difference between the two indexes and a reasonable value and a preset value and the change relative to historical value. Operating personnel can discover the generator sets with the problem of primary frequency modulation in time according to the calculation results and alarm information, good primary frequency modulation performance of the generator sets can also be promoted to be maintained, and safe and stable operation of grid frequency is maintained together.

The invention discloses a knot-free nanowire field effect transistor which comprises a channel, a source region and a drain region. The source region is arranged at one end of the channel, and the drain region is arranged at the other end of the channel; the outer surface of the channel is covered by a gate oxide layer which is covered by a grid electrode layer; and the grid electrode layer comprises a first grid electrode layer which is close to the source region and a second grid electrode layer which is close to the drain region. Compared with the prior art, the embodiment of the invention has the advantages that: by adopting a split gate structure, the speed of the charge carrier in the channel of the knot-free nanowire field effect transistor is increased, so the on-state current is increased, the off-state current of a device is reduced irrespective of the influence of the threshold voltage, the influence of the drain region on the device is screened, the drain induced barrier lowering effect is obviously weakened and the driving ability of the current is improved. Meanwhile, with the split gate, the transconductance feature of the knot-free nanowire field effect transistor under low voltage is obviously improved.

The invention provides a method for lowering the influence of reverse current on a battery voltage-resistant insulation test. The method includes the steps that test voltage, test time and insulation-resistance resistance valve qualified standards of the voltage-resistant insulation test are determined according to the nominal capacity of a battery to be tested, and the battery to be tested is the battery which is welded but not subjected to electrolyte injection; the voltage-resistant insulation test is conducted on the battery to be tested by the adoption of the determined test voltage in the determined test time; the result of the voltage-resistant insulation test of the battery to be tested is evaluated according to the determined insulation-resistance resistance valve qualified standard. According to the method, different test voltage, test time and insulation-resistance resistance valve qualified standards are set at the voltage-resistant insulation test stage targeted to batteries to be tested of different nominal capacities, and the influence of the reverse current on the battery voltage-resistant insulation test can be effectively shielded, so that test accuracy is improved, the number of qualified batteries is increased, and the reject ratio is lowered.

The embodiment of the invention discloses a method, a device and a system for determining a roaming place of mobile communication equipment, which relates to the technical field of communication. The invention aims to solve the problems of narrow adaptability, as well as low real-time and accuracy of roaming place determining technology used in the prior communication equipment. The method for determining the roaming place of the mobile communication equipment comprises the following steps: acquiring an IP address of a service GPRS supporting node (SGSN) of the mobile equipment in the roaming place; acquiring an autonomous system number of the network where the SGSN is positioned according to the IP address; and determining the roaming place of the mobile communication equipment according to the corresponding relation between the preset autonomous system number and the roaming place. The embodiment of the invention is based on global unified distribution of the autonomous system number and the basically-unchanged property, and has better applicability, can dynamically perceive the change of the IP address of the SGSN, and can accurately acquire information of the communication equipment in the roaming place in real time when the network is adjusted.

The invention discloses an LTE signal shielding method and an LTE signal shielding system based on system information. The LTE signal shielding method specifically comprises the steps of: step (1) receiving LTE information of a working frequency point of an LTE base station in a target shielded region; step (2) acquiring physical layer identification information of an LTE cell under the working frequency point by utilizing the received LTE information; step (3) generating shielding signals according to the physical layer identification information of the LTE cell; step (4) and periodically transmitting the shielding signals. The LTE signal shielding method and the LTE signal shielding system can reduce interference on LTE base stations operating normally outside the target shielded region, effectively improve the LTE signal shielding efficiency of the shielding system, and reduce the realization difficulty and realization cost of LTE shielding signals.

The invention discloses a novel non-contact type detecting device for measuring liquid level in an insulation container. The novel non-contact type detecting device for measuring the liquid level in the insulation container comprises an upper environmental electrode plate, a lower reference electrode plate, a vertical measuring electrode plate and a ground capacitance sensor, wherein each of the upper environmental electrode plate, the lower reference electrode plate and the vertical measuring electrode plate comprises a middle insulation medium layer, a metal measuring layer and a metal shielding layer; the ground capacitance sensor is used for measuring a capacitance value C1 of an isolated conductor of the metal measuring layer of the upper environmental electrode plate, a capacitance value C2 of an isolated conductor of the metal measuring layer of the lower reference electrode plate and a capacitance value C3 of an isolated conductor of the metal measuring layer of the vertical measuring electrode, and is also electrically connected with a controller; and the controller is used for calculating the liquid level of liquid in the insulation container relative to the height Hx of a bottom edge of the vertical measuring electrode plate according to a capacitance measuring result of the ground capacitance sensor. The novel non-contact type detecting device for measuring the liquid level in the insulation container is simple in structure, easy to implement and convenient to detect.

The invention discloses a compression-resistant type coaxial cable for improving a shielding effect, and a connection method thereof. The invention relates to the technical field of coaxial cable connection, in particular to the compression-resistant type coaxial cable and the connection method thereof. According to the compression-resistant type coaxial cable, a cable body is compressed and connected with a connector by means of a metal casing pipe provided with an elastic rubber sleeve, the compression-resistant type coaxial cable is suitable to be used in a strong vibration and shock environment, the compression joint strength is high, the tension resistance is good, the radial section of the metal casing pipe is a regular hexagon, no flash is formed after compression joint, the injection molding thickness of a protective injection molding layer is even, the shielding effect for the connector is good, the shielding performance of the coaxial cable is improved, the metal casing pipe further ensures that the coaxial cable is arranged at the dead centre of the connector after installation, can effectively eliminating point discharge, enables the stress to be distributed more evenly, can play a role of voltage equalizing ring so that an electric field at the joint is distributed to the peripheral grounding region, avoids the occurrence of corona discharge, and cannot cause any damage to the cable and the machine.

The invention discloses a bandwidth extension circuit of a cascode trans-impedance amplifier based on CMOS (complementary metal oxide transistor) technology. The bandwidth extension circuit is of completely bilaterally symmetric structure; each of the left and right parts of the bandwidth extension circuit includes a traditional primary cathode-input amplifier, a novel cascode auxiliary amplifierand a terminal source follower; the novel cascode structure is used herein to assist the amplifiers in shielding Miller effect; the concurrent PMOS (P-channel metal oxide semiconductor) structure provides greater transconductance for the cathode-input NMOS (N-channel metal oxide semiconductor); stray capacitance is partially shielded with a Pi-shaped matching network shielding portion; the terminal source follower is added to isolate stray post-capacitance, and total bandwidth of the circuit herein is increased; the circuit herein helps effectively reduce input impedance via RGC structure, andinput capacitance that is mainly of photoelectric detector junction capacitance is better isolated; the circuit herein gains adjustment and optimization for component parameters; differential structure is utilized so that working bandwidth of the circuit herein is greatly widened.

The invention discloses a distribution network fault positioning method based on a Bayes formula algorithm. The method comprises fault loop determination and switch saliency calculation. For an area with a high power distribution network automation level, an accurate position of a power distribution network fault is finally determined based on fault information returned by a FTU and a SCADA system and a Bayes formula distribution network fault positioning algorithm. Firstly, based on a GIS geometric network, according to fault information, network topology analysis is performed and a complete fault loop is determined so as to reduce a calculation range. And then, saliency of each measurement and control switch in the fault loop is calculated so as to position to a fault area. Based on the fault information returned by the FTU and the SCADA system and a Bayes formula algorithm theory, a set of scientific and systematic power distribution network fault positioning method is established.

The invention discloses a repair method of a damaged cable. The repair method comprises the following steps that: S1, a damaged portion of the cable is cleaned and dried; S2, an UV adhesive is injected into the damaged portion cleaned in the S1, the UV adhesive is initially cured through an UV lamp, so that a first UV adhesive layer can be formed; S3, a first metal net is laid on the surface of the first UV adhesive layer formed in the S2; and S4, the UV adhesive is injected into the surface of the first metal net mentioned in the S3 again, and the UV adhesive is cured through the UV lamp, so that a second UV adhesive layer can be formed, and the outer surface of the second adhesive UV layer and the surface of the shell of the cable are located in the same cambered surface. With the above steps adopted, the damaged portion of the cable can be repaired, and the shielding performance of the cable will not be affected at all; and the first UV adhesive layer is initially cured, and therefore, the first metal net can be well embedded in the UV adhesive, and an outermost layer has the greatest bonding strength, and therefore, the repaired portion will not fall off assuredly.

The invention provides a sensor for detecting the flux defect of a wire rope. The sensor structurally comprises: a signal intelligent processing module, a power module, an excitation coil driving module, an excitation coil, induction coils, a signal preprocessing module, an adder and a differential amplification output module. The sensor is characterized in that: the power module, the excitation coil driving module, the excitation coil, the induction coils, the signal preprocessing module, the adder and the differential amplification output module are sequentially connected; and the power module and the differential amplification output module are respectively connected to two sides of a data intelligent processing module to form a closed loop, while the data intelligent processing moduleis connected with the signal preprocessing module. Two sets of induction coils are used in the sensor to perform detection simultaneously, so that the measured damage signal is doubled, and the signal-to-noise ratio of the damage signal inside and outside the wire rope is improved; and a full-circle induction coil composed of two semi-circular coils is used, so that more on-site operability is realized in the actual installation process and the installation is simpler and more convenient.

The invention relates to the field of embedded technology, in particular to a system and a method for mapping a C language structure to a relation database table. The invention discloses a system for mapping the C language structure to the relation database table, which simplifies the conversion from the C language structure to the relation database table. The system for mapping the C language structure to the relation database table comprises a mapping code generation engine module from the C language structure to the relation database table, a mapping extendable mark language describing module from the C language structure to the relation database table and a use module of a mapping code from the C language structure to the relation database table. The invention also provides a method for mapping the C language structure to the relation database table. The invention simplifies the cockamamie data management, shields the influence of the change of a lower-layer database on the upper-layer application simultaneously and improves the transferability of the application.