38results about How to "Control bandwidth" patented technology

The invention belongs to the technical field of functional materials and specifically relates to a high temperature-resistant frequency selective surface (FSS) wave-transparent material and a preparation method thereof. A high temperature-resistant ceramic matrix is taken as a carrier of the high temperature-resistant FSS wave-transparent material and an FSS with a resonant structure is attached onto the surface of the high temperature-resistant ceramic matrix. The FSS is directly prepared on the ceramic matrix by use of a high temperature-resistant conducting material, has the high temperature resistance in contrast with a flexible film FSS and is capable of meeting the hiding requirement of an antenna housing during high-Mach flying. The high temperature-resistant FSS wave-transparent material is a compound material of a plurality of layers of FSSs; due to the design of size and shape parameters of the resonant structure of the FSS, the frequency bandwidth and the transmittance of incident electromagnetic waves can be effectively controlled, and a hiding effect with in-band high transmittance and out-of-band rejection can be realized.

The invention relates to a tri-frequency microwave bandpass filter which adopts two different groups of stepped inpedance resonators, an anti-parallel coupled line way is adopted between a long-step inpedance resonator (1) and a long-step inpedance resonator (2) of the filter, an end coupling way is adopted between a short-step inpedance resonator (3) and a short-step inpedance resonator (4), andthe input and output adopt clearance coupling. The coupling of the long-step inpedance resonators is utilized to form a first passband and a third passband of the filter, and the coupling of the short-step inpedance resonators forms a second passband of the filter. Three passbands of the filter are formed by utilizing different resonators, the bandwidth of the filter can be effectively controlledby adopting a coupling way; the tri-frequency microwave bandpass filter can be applied to a microwave communication system.

The invention discloses a non-metallic material for driving the photocatalytic decomposition of water by using efficient visible light, which belongs the field of material preparation and application. A graphite phase boron-carbon-nitride as a photocatalytic water splitting catalyst is a stable inorganic non-metallic photocatalyst, and through the efficient utilization of solar energy and the photocatalytic decomposition of water so as to produce hydrogen and oxygen, a situation that current conventional photocatalytic water splitting catalytic materials mainly include (precious) metal oxides or (sulfides) is expanded, and a defect that a metal-containing catalytic material is high in cost, unstable in chemical or physical properties, and not friendly to the environment is avoided. The graphite phase boron-carbon-nitride as an inorganic nonmetal has the characteristics of chemical corrosion resistance, high temperature resistance, good thermal conductance, high visible light response and the like, so that the graphite phase boron-carbon-nitride has a better application prospect in the field of photocatalysis. The non-metallic material disclosed by the invention is simple in method, cheap and easily-obtained in raw materials, low in environmental pollution, and conducive to the large-scale industrial production, and has remarkable economic and social benefits.

The invention discloses a rectangular substrate integrated waveguide sharing cavity-based duplexer. The duplexer comprises a rectangular dielectric substrate (5), a metal grounding layer (4) and a metal layer (7), wherein the metal grounding layer (4) is fully attached onto a lower surface of the dielectric substrate (5), the metal layer (7) is attached onto an upper surface of the dielectric substrate (5), the duplexer also comprises a plurality of metal through holes (6), the plurality of metal through holes (6) penetrate through the dielectric substrate to connect the metal layer (7) and the grounding layer (4), a rectangular sharing cavity (a), a first low-frequency rectangular cavity (b), a first high-frequency rectangular cavity (e), a second low-frequency rectangular cavity (c) and a second high-frequency rectangular cavity (d) are encircled by the plurality of metal through holes (6), the first low-frequency rectangular cavity (b) and the high-frequency rectangular cavity (e) are adjacent to a long edge of the sharing cavity (a), the second low-frequency rectangular cavity (c) is connected with the first low-frequency rectangular cavity (b), and the second high-frequency rectangular cavity (d) is connected with the first high-frequency rectangular cavity (e). The duplexer is high in integration, the bandwidth ratio is easy to change, and the frequency is enough high and is controllable.

A network device, capable of understanding communications between an end user and the core network on a RAN network is disclosed. In some embodiments, the device is able to decode the control plane and the user plane. As such, it is able to determine when the end user has requested multimedia content. Once this is known, the device can optimize the delivery of that content in several ways. In one embodiment, the device requests the content from the content server (located in the core network) and transmits this content in a just-in-time manner to the end user. In another embodiment, the device automatically changes the encoding and resolution of the content, based on overall monitored network traffic. In another embodiment, the device automatically selects or modifies the format and resolution options based on overall bandwidth limitations, independent of the end user.

The invention relates to a surface sonic wave element, which comprises one piezoelectric base plate, the first energy exchanger and the second energy exchanger that on the base plate and coupled. Wherein, at least one energy exchanger has two electrodes parallel in screw shape. Compared with present technique, the inventive electrodes are alternated into screw shape, to obtain long supposition length and reduce the insertion consumption; in addition, the parameters of screw electrode as length, etc can be changed to control the insertion consumption, frequency width, etc.

The invention discloses a small active vibration control system based on piezoelectric ceramic and a piezoelectric accelerometer, and relates to the technical field of precision machineries and modern control. The system comprises a micro-vibration source (00), a sensor (10), an acceleration module (20), a displacement module (30), a speed module (40), a first summator (50), an amplifying and filtering module (60), a second summator (70), a driving module (80) and the piezoelectric ceramic. The small active vibration control system has the advantages of simple structure, small size and easiness in integration, and can obtain a wider control band width, wherein the control frequency can achieve 200 Hz or even higher; the electric damping is adopted to replace mechanical damping, so that the realization is simpler; and a displacement signal is adopted as low-frequency drift compensation instead of adopting a method of direct current feedback to execute direct current stability, so that enough low-frequency gain and phase margin are guaranteed, and the control band width and the suppression ratio are effectively improved.

The invention discloses a particle fluorescence detection wavelength instant configuration beam splitting system which comprises a laser light source and an optical shaping unit, wherein the optical shaping unit is arranged in front of the laser light source; a fluid forming unit is arranged in front of the optical shaping unit; an acousto-optic tunable filter is arranged in front of the fluid forming unit and is connected with a radio frequency driver; the fluid forming unit comprises sheath fluid, a sample, particles and a particle detection area. According to the technical scheme, optional selection of central wavelength, bandwidth control of a fluorescence channel and modulation of fluorescence transmittance in an operating range of the acousto-optic tunable filter are realized in a particle fluorescence detection process according to the dye types and a to-be-detected target fluorescence wavelength channel needing to be dynamically configured; the defect that the fluorescence detection beam-splitting channel in conventional particle fluorescence detection beam-splitting structures such as a flow cytometry is relatively fixed and is difficult to adjust is overcome; the system can be unique or is combined with an optical filter beam-splitting method to serve as a beam-splitting scheme for particle fluorescence detection.

The present invention belongs to the technical field of microwave communication and provides a dual-passband filter suitable for microwave and millimeter wave planar circuits. The dual-passband filter includes a dielectric substrate provided with a grounding through hole, a main line on the upper surface of the dielectric substrate and a metal floor positioned below the dielectric substrate. The main line is formed by concatenation of two annular stepped impedance resonators which are distributed in axial symmetry. The two loading knot annular stepped impedance resonators are connected through a grounding through hole. The two annular stepped impedance resonators are respectively connected to an input feed line and an output feed line. The novel dual-passband filter is characterized in that the side of the ring of each annular stepped impedance resonator is embedded with an open circuit transmission line. The dual-passband filter solves the problem of miniaturization of a traditional dual-passband filter, and simultaneously has the characteristics of easy center frequency and bandwidth control, high frequency selectivity, good isolation between bands, a compact structure and a small size.

The invention discloses a building grouting plumpness detection device which comprises a signal transmitting module, a signal receiving module and a data processor. The signal transmitting module comprises a USB (universal serial bus) data interface, an electric quantity display module, an adjustment switch, an encoding signal storage module, a power module, an excitation signal transmitting switch, a signal amplifying module, an encoding signal input interface, a super-magnetic vibration module and a convertible transmitting module. The building grouting plumpness detection device has the advantages that an adjustable excitation signal forming technique method is combined with an adjacent frequency difference analyzing method, the device is simple to operate and high in sensitivity, discrimination precision is improved, and on-line real-time detection of large concrete structures can be performed.

The invention discloses a traffic statistics method based on wildcard characters for use in a software defined network (SDN). The method comprises the following steps that: a controller partitions flow on SDN switches in the SDN by taking the wildcard characters as units to obtain flow sets; information about flow sets to be collected on the SDN switches is calculated by taking minimization of traffic statistics costs of the SDN switches as an optimization target; traffic statistics requests are sent to all the SDN switches according to the information about the flow sets to be collected on the SDN switches, wherein each request specifies one wildcard character on a certain SDN switch; the SDN switches parse wildcard character fields according to the traffic statistics requests, package traffic information of all flows matched with the wildcard characters to generate response packets, and transmit the response packets to the controller; and the controller generates traffic statistics information according to the collected response packets of all the SDN switches. Through adoption of the traffic statistics method, corresponding statistics tasks can be assigned to the switches according to the traffic condition and resource condition of a current network, and congestion of a control channel is avoided.

Network access control method based on Neutron and GBP includes steps: the container cloud platform creates partitions, monitors the creation of Partition events, obtaining a token, creats the L2Policy associated with the L3Policy entered by the user in Openstack, creats a network with L2Policy,creats Subnet through Network, specifies Subnet Pool as L3Policy's Subnet Pool, and creats Policy TargetGroup corresponding to L2Policy and Subnet; GBP's resource is associated with Openstack's resource. The invention realizes network isolation of Kubernetes cluster tenants, network on-off control between container groups of tenants, network on-off control between tenant inner packaging groups and virtual groups, and bandwidth control of tenant inner packaging by connecting Openstack and GBP.

The present invention provides a coupling structure dielectric resonator filter. The coupling structure dielectric resonator filter can solve the problem of the conventional dielectric resonator filter, for example, the conventional dielectric resonator filter can not realize structural miniaturization and improve pass-band selectivity at the same time. The coupling structure dielectric resonatorfilter comprises a rectangular waveguide external cavity, a first dielectric resonator arranged along the Y axis direction, a second dielectric resonator arranged along the Z axis direction, a third dielectric resonator arranged along the X axis direction, annular feeder lines and radio frequency connectors. The three dielectric resonators are centrally symmetric, and the structure sizes of the three dielectric resonators are the same. The geometric centers of the first dielectric resonator and the third dielectric resonator are located at the axis of the transmission direction of the rectangular waveguide, the geometric center of the second dielectric resonator deviates from the axis of the transmission direction of the rectangular waveguide, and the deviation point is located at the angular bisector of the X axis and the Y axis. By regulating the value of the deviation amount and the deviation direction, the sizes of direct coupling and cross coupling between the resonators can be controlled, so that the purposes of controlling the bandwidth of the filter and the position of the transmission zero point are realized, and the miniaturization of the filter structure is realized.

The invention discloses a miniaturized broadband power divider circuit based on spur lines. The circuit includes a first port (1), a second port (2), a third port (3) and an isolation resistor (R1), wherein the isolation resistor (R1) is arranged between the second port (2) and the third port (3), a transmission path from the first port (1) to the second port (2) adopts a microstrip line, a transmission path from a first port (1) to a third port (3) adopts a microstrip line, a first spur line (20) is arranged on the microstrip line of the transmission path from the first port (1) to the second port (2), a second spur line (30) is arranged on the microstrip line of the transmission path from the first port (1) to the third port (3), and the first spur line (20) and the second spur line (30) are used for reducing the size of the power divider, reducing insertion loss and expanding the bandwidth of the power divider. The relative electrical length of the microstrip lines increase based on the spur lines, the actual length is shortened, the size of the power divider is reduced, and stepped impedance lines and branch lines are equivalently introduced to the transmission paths to expand the bandwidth of the power divider, and the power divider is smaller in size than a traditional Wilkinson power divider, and has larger bandwidth and smaller insertion loss.

The invention discloses a low-frequency Intelligent nonlinear tuning mass damper (TMD) made of shape memory alloy (SMA) and a making method thereof. The damper includes a main structure, a shell, an SMA spring unit, a mass block, a preloaded spring unit, an annular sliding support, an annular limiting block, a permanent magnet and a copper plate, wherein the shell comprises a bottom plate, a stiffening side plate, a stiffening upper-cover plate, a vertical stiffening rib, a side plate circumferential-direction stiffening rib, an upper cover plate circumferential-direction stiffening rib and a longitudinal stiffening rib; the SMA spring unit includes a horizontal hinged joint, a horizontal guide rod, a SMA spring, a SMA core, a temperature control layer and a protective layer; a preloaded spring joint includes a universal hinged joint, a vertical guide rod and a preloaded spring. The invention aims to provide the low-frequency Intelligent nonlinear tuning mass damper (TMD) made of shape memory alloy (SMA). The SMA is used to provide the characteristics of hysteresis resilience and intelligent control, and a negative stiffness element is used to achieve the long period characteristic of the TMD; therefore the tuned mass damper has the advantages of a long period, controllable wide band control, intelligent adjustment, small occupancy space and the like.

The invention discloses a six-degree-of-freedom Lorentz platform for detecting and repairing an LED display screen, the six-degree-of-freedom Lorentz platform is composed of a rotor system and a stator system, and the rotor system mainly comprises a table top, a photoelectric coded disc rotor assembly, an outer rotor assembly and an inner rotor assembly; the stator system mainly comprises a photoelectric coded disc stator assembly, a supporting seat, an axial translation and radial deflection Lorentz magnetic bearing stator assembly, a radial translation and axial rotation Lorentz magnetic bearing stator assembly, an axial displacement sensor framework, an axial displacement sensor, a radial displacement sensor and a universal ball protection bearing. According to the invention, the axial translation radial deflection Lorentz magnetic bearing and the radial translation axial rotation Lorentz magnetic bearing are adopted to realize six-degree-of-freedom high-precision rapid motion positioning suspension driving control of the platform, and the motion positioning precision, the dynamic response speed and the control bandwidth of the platform are improved while the azimuth adjustment capability of the platform is improved.

The invention discloses a link selection method based on shortest response time, and relates to the technical field of computers. The method comprises the following steps: establishing a complete detection system which is responsible for completing network full-link pair quality detection to obtain data indexes on a physical network link, and reporting the data to a data system; a data system being responsible for summarizing all detection data and providing retrieval capability according to four factor classification ratios of time, nodes, packet loss rate and routing; analyzing and providinga complete scheduling model through an intelligent analysis system according to the data provided by the data system; realizing flow scheduling of the whole network through a scheduling model provided by the intelligent analysis system and the scheduling system, and guaranteeing that all data packets can reach a destination address in a short time. According to the method, human function intelligence and a big data technology are combined, a network flow model in a future period can be simulated on the basis of data, scheduling is carried out on the basis of response time which is the most direct factor, and optimal link selection is realized.

The invention provides a vibration balance type low-noise deep sea hydrophone and a manufacturing method thereof. The vibration balance type low-noise deep sea hydrophone comprises a metal block, piezoelectric ceramic tubes symmetrically arranged on the two sides of the metal block, end covers, a sound transmission oil bag, a base sealed at the opening part of the sound transmission oil bag, and a watertight connector connected with the exterior of the base. An oil injection hole is further formed in the base; one end of each piezoelectric ceramic tube is vertically arranged on the metal block, the other end of each piezoelectric ceramic tube is connected with the end cover, the end cover is provided with an oil inlet hole and a wire hole, the metal block and the piezoelectric ceramic tube are both arranged in the sound transmission oil bag, the sound transmission oil bag is filled with an oily medium, and the watertight connector is connected with the positive electrode and the negative electrode of each piezoelectric ceramic tube for signal transmission. According to the hydrophone, the structural symmetry design is adopted, the acceleration counteracting principle is utilized, the influence of the external vibration transmission effect on the acceleration sensitivity and the receiving sensitivity of the hydrophone is greatly reduced, and the hydrophone has the advantages of being high in impact vibration noise resistance, high in hydrostatic pressure resistance and high in sensitivity.

The invention discloses a microstrip filter based on electromagnetic mixed coupling. The microstrip filter comprises a microstrip board and further comprises a metallized through hole, a first resonator, a second resonator, a third resonator, an input port feeder line and an output port feeder line which are arranged on the microstrip board. One ends of the first resonator, the second resonator and the third resonator are connected with the metallized through hole, and the first resonator, the third resonator and the second resonator are arranged to be in central line symmetry. The input port feeder line and the output port feeder line are symmetrically arranged on the outer side of the first resonator and the outer side of the third resonator respectively. The microstrip filter can adjust the intensity of magnetic coupling and electric coupling, so that the bandwidth of the filter is controlled flexibly, and the size is small.

The invention discloses a method and device for controlling AXI bus bandwidth. The method comprises the steps: obtaining a read address effective signal and a read data effective signal from the AXI bus; determining a read delay based on the read address valid signal and the read data valid signal; determining a burst read length based on the protocol of the AXI bus, and determining an expected read period based on the burst read length, the read delay and the expected bandwidth; and setting the read address effective signal period of the AXI bus as an expected read period. The AXI bus bandwidth can be controlled in a universal mode, and the universality and convenience of AXI bus control are improved.

The present invention relates to the field of wireless communications. Embodiments of the present invention provide a method and device for determining transmission congestion. Because lost packets caused by transmission congestion and lost packets caused by a transmission error may both exist in the actual number of lost packets, the method provided by the present invention comprises: determining a first linear relationship during non-transmission congestion and a second linear relationship during transmission congestion according to the actual number of sent packets and the actual number of lost packets in a preset number of transmission cycles; determining a first theoretical number of lost packets according to the actual number of lost packets and the first linear relationship, and determining a second number of lost packets according to the actual number of lost packets and the second linear relationship, to determine whether transmission congestion occurs according to a first parameter determined according to the actual number of lost packets and the first theoretical number of lost packets and a second parameter determined according to the actual number of lost packets and the second theoretical number of lost packets. Therefore, the transmission congestion can be more accurately determined, appropriate interface bandwidth of a transport network can be controlled to allocate, and the throughput of the transport network is improved.

The invention relates to the technical field of filters, in particular to a filter, a manufacturing method thereof, a multiplexer and communication equipment. In the filter, the thickness ratio between the electrode layer and the piezoelectric layer of the resonator is limited within a certain numerical range, and the filter with the structure not only can eliminate the influence of high-order resonance, but also can control the deterioration of performances such as insertion loss, bandwidth and the like of the filter within an acceptable range.