33 results about "Pre filtering" patented technology

The application relates to a high-pressure-resistant PES filter membrane and a preparation process thereof, which comprises a porous main body, the porous main body comprises a mesoporous layer, a pre-filter layer and a separation layer in sequence along the thickness direction, the surface of one side of the mesoporous layer is a liquid inlet surface, the SEM average pore diameter of the pre-filter layer is larger than that of the mesoporous layer; the PMI average pore diameter of the filter membrane is 0.15-0.6 microns; a plurality of liquid inlet holes are distributed on the liquid inlet surface, the SEM average pore diameter K of the liquid inlet hole is 0.2-1.5 microns, and the hole area rate of the liquid inlet surface is 5-35%; the pore diameter of the liquid inlet hole is not less than 1.5K, which is a main liquid inlet hole, and the hole area rate of the main liquid inlet hole is 2-25%. After the mesoporous layer is introduced into the filter membrane, the mechanical property of the filter membrane is obviously improved, so that the pore structure of the porous main body on the liquid inlet surface and near the liquid inlet surface of the filter membrane does not deform too much under high pressure, so that the filter membrane still maintains a large effective flow channel area, and the high flux and high load of the filter membrane are ensured.

The invention relates to a connection unit (100) for a network (101), in particular a vehicle network, comprising: a switching device (10) for establishing communication between network components, wherein the switching device (10) comprises the following components: - a recognition unit (11) for providing a pre-filtering function to check incoming messages (EF) for their validity, and - a filter unit (12) for providing security filtering for hardware-based firewall functionality, and a security device (20), in particular an outsourced one, for providing hardware- and / or software-based firewall functionality, wherein the detection unit (11) extracts a part (FH) or some features from a part (FH) of incoming messages (EF) and provides them to the security device (20) to dynamically create adaptive filter rules (FR), and wherein the safety device (20) provides the created filter rules (FR) to the filter unit (12).

The invention discloses a method and a device for realizing FTP (File Transfer Protocol) file restoration, on one hand, continuous data streams are restored under the conditions of disorder, retransmission, short-time packet loss and the like by analyzing an FTP control channel and combining indexed backtracking and TCP (Transmission Control Protocol) stream recombination, so that a restoration gap is reduced to the maximum extent, and the integrity and the success rate of FTP file restoration are improved; and on the other hand, by pre-filtering the non-preset protocol and cooperating with establishment of the file index information relationship of the original message corresponding to the quintuple information, the original message retention amount and disk write amplification are significantly reduced, so that the storage and I / O overhead is reduced, the system throughput is improved, and the historical retention window is prolonged.

The composite filter element comprises a bottle body, a first filter element containing cavity and a second filter element containing cavity are formed in the bottle body and used for containing a first filter element assembly and a second filter element assembly respectively, and the first filter element containing cavity and the second filter element containing cavity are separated through a water separation piece; the first filter element accommodating cavity is communicated with an external water source through the first water inlet and is communicated with the second filter element accommodating cavity through the first water outlet and the second water inlet; the first filter element assembly comprises a pre-filtering piece, the first end of the pre-filtering piece is arranged close to the first face of the bottle body, and the second end of the pre-filtering piece is arranged close to the second face of the bottle body. A front filter part is arranged on the side, close to the water separation part, of the pre-filter part, the first end of the front filter part is arranged close to the first face of the bottle body, the second face of the front filter part is opposite to the first face, and the arrangement range of the front filter part is smaller than that of the pre-filter part. According to the composite filter element, the blocking time of the pre-filtering part can be delayed, so that the service life of the composite filter element is prolonged.

The application discloses a filtering mechanism based on wafer chemical nickel-palladium-gold plating, and belongs to the technical field of filtering and separating, which comprises a pre-filtering mechanism, a V-shaped shunt pipe is arranged at the bottom end of the pre-filtering mechanism, and a liquid flow channel switching mechanism is arranged in the V-shaped shunt pipe; the pre-filtering mechanism comprises a filter cartridge, a patting and pressing mechanism and a turnover mechanism are arranged in the filter cartridge, a filter bag is fixedly sleeved to the outer side of the turnover mechanism; an electric sliding rail is fixedly installed at the outer side of the filter cartridge, and a driving rack is fixedly installed on the sliding block of the electric sliding rail. Through the pre-filtering mechanism, the V-shaped shunt pipe and the liquid flow channel switching mechanism, multi-stage filtering of the plating solution is realized, the pre-filtering mechanism can effectively intercept larger particles, the particles can be prevented from directly entering the precision filter, the burden of the precision filter is significantly reduced, the service life of the filter core is prolonged, and long-term stable operation of the filtering system is ensured.

The invention relates to a filter material (10) for air filtration in a filter element (100) and to a filter element comprising such a filter material. The filter material (10) is equipped with an inflow-side pre-filter layer (2), an activated carbon layer (3) and a composite layer (1) having at least one membrane. According to the invention, the layers are integrally connected to one another. Due to the combination of the pre-filter layer and the composite layer with the membrane in the filter material, high dust holding capacity is achieved while achieving high quality factor in an advantageous manner.

A mass spectrometer comprises an ion source 10 (Figure 1), a mass pre‐filter 20 downstream of the ion source, a collision cell 30 (Figure 1), at least one mass filter downstream of the collision cell,

A filter material for air filtration in a filter element, including an inflow-side pre-filter layer, an active carbon layer, and a composite layer which is in the form of a fine filter layer including nanofibers. The pre-filter layer, the active carbon layer and the composite layer are connected to one another in materially bonded fashion. The composite layer includes at least one top layer, a nanofiber layer and a carrier layer.

The invention relates to a pre-filter comprising a filtering part comprising a treated water outlet means, a pre-filter body arranged to house the filtering part, a base arranged to receive the pre-filter body, and comprising a supply opening for water to be treated, a closure system present on the pre-filter body, suitable for being housed in the base and for closing the supply opening for water to be treated, the pre-filter also comprising mutual connection means arranged to assemble the pre-filter, and a control means controlling the filtering part and the connection means so as to be able to assemble or disassemble the pre-filter while closing or opening the water supply opening.

A system and method for an anti-hopping algorithm for an indoor localization system. A method includes receiving a plurality of beacons, each of the plurality of beacons is received from a respective transmitter, pre-filtering the plurality of beacons to identify a subset of the plurality beacons that exceed a minimum signal threshold, and comparing a signal strength of each beacon of the subset to a strongest signal strength threshold of a currently assigned beacon. A method includes selecting a beacon from the subset, the selected beacon has been detected to exceed the strongest signal strength threshold of the currently assigned beacon a predetermined consecutive number of times, and assigning a location to the receiver, the location corresponds to a location of a transmitter of the selected beacon.

A technique for performing a ray tracing operation is provided. The technique includes traversing to a pre-filtering node for a tested ray intersecting a geometry associated with the bounding volume hierarchy, the pre-filtering node including information of triangles for filtering out leaf nodes of the bounding volume hierarchy; evaluating quantized rays corresponding to the rays for the quantized triangles of the pre-filtered nodes to filter out one or more triangles of the leaf nodes without consideration; and testing unfiltered triangles of the leaf nodes and not testing filtered triangles of the leaf nodes.

The terminal filter is characterized in that the terminal filter comprises a shell and a filtering device, a filtering cavity is formed in the shell, an inlet and an outlet which are communicated with the filtering cavity are formed in the two ends of the shell respectively, and the filtering device is arranged in the part, between the inlet and the outlet, of the filtering cavity; the filtering device comprises a pre-filtering layer, a hollow fiber filter element, a first end seal and a second end seal, the pre-filtering layer is of a hollow columnar structure internally provided with a cavity, and the hollow fiber filter element is installed in the cavity of the pre-filtering layer; the first end seal is mounted at the first end of the pre-filtering layer and the first end of the hollow fiber filter element and right faces the inlet, and the second end seal is mounted at the second end of the pre-filtering layer and right faces the outlet. According to the invention, the cost is reduced and the reliability is improved.

To solve the problem that joining of a pre-filter and an air filter is performed by holding and fixing the pre-filter between a device body and the air filter, and the pre-filter is broken when it is held.SOLUTION: Provided is a replaceable pre-filter which can be installed on an air filter by electrostatic force without impairing air permeability of an air filter unit even when attached to the air filter.SELECTED DRAWING: None

The utility model relates to a filter material (10) for filtering air in a filter element (100) and a filter element comprising the filter material. The filter material (10) is equipped with an inflow-side pre-filter layer (2), an activated carbon layer (3) and a composite layer (1) having at least one membrane. According to the utility model, the layers of materials are connected with each other in a locking manner. Due to the combination of the pre-filter layer and the composite layer with the membrane in the filter material, high dust holding capacity is achieved while achieving high quality factor in an advantageous manner.

The invention relates to a filter material having a nanofiber layer and a filter element made of such a filter material. The filter material (10) is equipped with a pre-filter layer (2) on the inflow side, an activated carbon layer (3) and a composite layer (1) which is designed as a fine filter layer having nanofibers. According to the invention, the layers are integrally bonded to one another. Since the pre-filter layer and the composite layer with nanofibers are combined in one filter material, a high dust storage capacity and a high mass coefficient are advantageously achieved at the same time.

The application discloses a method and device for realizing FTP file restoration. On one hand, continuous data flow is recovered under the conditions of disorder, retransmission, short-time packet loss and the like by analyzing an FTP control channel and combining index backtracking and TCP flow recombination, so that the restoration gap is minimized, and the completeness and success rate of FTP file restoration are improved. On the other hand, by pre-filtering a non-pre-set protocol, cooperating with the establishment of file index information relationship of the original message corresponding to the five-tuple information, the original message saving amount and disk write amplification are significantly reduced, so that the storage and I / O overhead are reduced, the system throughput is improved, and the historical retention window is prolonged.

Aspects are provided for radio frequency (RF) front end modules. The radio frequency front end modules comprises a common antenna node, an antenna switch matrix (ASM) comprising an ASM first signal terminal and at least two ASM second signal terminals, the ASM first signal terminal being coupled with the common antenna node; at least two RF micro acoustic filters coupleable to the common antenna node via the ASM. At least a first RF micro acoustic filter of the at least two RF micro acoustic filters comprises a micro acoustic pre-filter comprising a pre-filter first signal terminal and a pre-filter second signal terminal, the pre-filter first signal terminal coupled with the ASM; and a micro acoustic main-filter comprising a main-filter first signal terminal and a main-filter second signal terminal. The micro acoustic pre-filter and the micro acoustic main-filter being separated by a signal line coupling the pre-filter second signal terminal to the main-filter first signal terminal, the micro acoustic pre-filter being on a different die than the micro acoustic main-filter and being coupled by the signal line.

The utility model provides a composite electrostatic cotton filter material. The composite electrostatic cotton filter material comprises a gradient pre-filtering layer, an electrostatic filtering layer and a reinforcing layer which are arranged in sequence, the static filtering layer is in a sinusoidal waveform, an outer supporting layer is arranged between the gradient pre-filtering layer and the static filtering layer, an inner supporting layer is arranged between the gradient pre-filtering layer and the reinforcing layer, and the side, close to the static filtering layer, of the outer supporting layer and the side, close to the static filtering layer, of the inner supporting layer are in sinusoidal waveforms matched with the static filtering layer; according to the utility model, through the sinusoidal waveform electrostatic filtering layer, the filtering area of the electrostatic filtering layer in the unit filtering material area can be increased, the electrostatic adsorption area can be increased, and the electrostatic adsorption capacity of dust can be improved; the side, close to the electrostatic filtering layer, of the outer supporting layer and the side, close to the electrostatic filtering layer, of the inner supporting layer are both sinusoidal waveforms matched with the electrostatic filtering layer, the outer supporting layer and the inner supporting layer support the electrostatic filtering layer on the two sides of the electrostatic filtering layer, the sinusoidal waveforms are kept, and it is guaranteed that the electrostatic adsorption layer has the stable and large electrostatic adsorption area.

The utility model relates to the technical field of gas analyzers, and discloses a pre-filtering structure for a gas analyzer, which comprises a filtering bin, a gas inlet pipe is fixedly assembled on the outer wall of the filtering bin, a gas outlet pipe is mounted on the outer wall of the filtering bin, and a control panel is fixedly assembled on the outer wall of the filtering bin. An audible and visual alarm is fixedly assembled on the outer wall of the filtering bin, an air velocity sensor is fixedly assembled in an inner cavity of the air outlet pipe, and a mounting frame is mounted in the inner cavity of the filtering bin. According to the pre-filtering structure for the gas analyzer, the filter screen and the filter plate are arranged in the inner cavity of the filter bin, impurities in air can be filtered under the action of the filter screen, so that the impurities cannot penetrate through the filter screen, and then dust in the air is filtered under the action of the filter plate; impurities and dust in the air can be removed before the air enters the gas analyzer, so that the influence on the normal use of the gas analyzer is avoided.

The application relates to a data detection method and device based on multi-mode matching, equipment and a medium. The method comprises the following steps: obtaining a to-be-detected data packet, extracting quintuple information of the to-be-detected data packet, determining a corresponding signature group from a preset signature group table based on the quintuple information, wherein the signature group is associated with a plurality of detection rules and a pre-filtering engine, performing fast multi-mode scanning on data content of the to-be-detected data packet based on the pre-filtering engine to obtain a preliminary screening result, if the preliminary screening result indicates that the data content comprises at least one mode feature, calling a corresponding multi-mode matching algorithm to perform accurate mode matching on the data content to obtain at least one matched mode identifier, obtaining a target detection rule associated with the at least one matched mode identifier from the plurality of detection rules, and performing rule matching based on the target detection rule to generate a data detection result.

The invention discloses a hybrid Katz centrality measurement system based on pre-filtering, electronic equipment and a storage medium. The measurement system comprises six parts of data stream sampling, centrality normalization calculation, Prefilter precise region maintenance, EdgeSketch compression back-end storage, time attenuation and final centrality query. The invention further discloses electronic equipment and a storage medium. And through an incremental updating mechanism of hierarchical storage management and time perception, the contradiction among calculation efficiency, memory occupation and measurement precision is effectively balanced.

The utility model discloses a filtering device for production, which comprises a stirring tank body, a pre-filtering tank body, a pre-filtering filter screen and a secondary filtering filter screen, a stirring cavity and a discharging channel are arranged in the stirring tank body, the discharging channel is positioned below the stirring cavity, and a stirring mechanism is arranged in the stirring cavity; the pre-filtering tank body is arranged above the stirring tank body, a feeding pipe is arranged between the pre-filtering tank body and the stirring tank body, an opening is formed in one side of the pre-filtering tank body, and an annular block is arranged in the pre-filtering tank body; the pre-filtering filter screen can penetrate through the opening and is arranged in the pre-filtering tank body, and the pre-filtering filter screen is in lap joint with the annular block and covers the interior of the whole pre-filtering tank body; the secondary filter screen is arranged between the discharging channel and the stirring cavity; wherein the mesh number of the secondary filter screen is larger than that of the pre-filter screen. Through double filtration of the pre-filtration filter screen and the secondary filtration filter screen, and meanwhile, the pre-filtration filter screen can be replaced at any time, so that the continuity of a filtration process is effectively improved, and the filtration efficiency and the product quality are improved.

The utility model discloses an automatic adjusting device for increasing the switching period of prefilter, including grinding head motor and filter mechanism, the front bottom of grinding head motor is fixedly connected with limit box, the filter mechanism is installed in the limit box top, the periphery of grid filter cloth is fixedly connected with silica gel ring, and the silica gel ring is fixed in the limit box. The top of the silica gel ring is provided with a limiting plug, and one side of the limiting box is fixedly connected with a switching periodic table. According to the automatic adjusting device for increasing the switching period of the pre-filter, a worker can be conveniently reminded of the period time for replacing grid filter cloth, the operation mode is convenient and fast, the operation time is shortened, the working efficiency of the operator is improved, round holes are formed in the surfaces of four sets of protruding blocks on the top face of a limiting box, the clamping connection positions of the protruding blocks and limiting plugs are very tight, and the working efficiency is improved. And the phenomenon that the limiting chock plug moves in the using process is avoided, water can be conveniently added into the glass in the polishing process, the polishing state of the glass can be conveniently observed, and therefore the comfort degree is improved.

The invention discloses an invalid session pre-filtering method and device, a storage medium and a program product, and relates to the technical field of smart home / smart home, and the invalid session pre-filtering method comprises the steps: determining a session mapping table of a target subscription theme, and carrying out the state verification of a plurality of sessions in the session mapping table; under the condition that the invalid sessions exist in the session mapping table, respectively determining priorities of the plurality of invalid sessions; and determining a filtering strategy of the plurality of invalid sessions based on the priorities of the plurality of invalid sessions, performing layered filtering on the plurality of invalid sessions in the session set according to the filtering strategy to obtain a plurality of invalid session sets, and then respectively removing the plurality of invalid session sets. According to the method, the invalid sessions are filtered and removed in a layered manner, so that the invalid sessions in the subscription set are prevented from being accumulated for a long time, the resource consumption of the server is reduced, the delay growth caused by the accumulation of the invalid sessions is avoided, and the pushing efficiency is improved.

A method for targeted advertisement includes transmitting a pre-filter to the user device, responsive to contextual information from a user device, to determine, using a processor, one or more inferences based on physical browsing information, collected at the user device, in compliance with one or more privacy policies of the user. The method also includes receiving one or more inferences determined by the pre-filter from the user device and transmitting one or more targeted advertisements to the user device based on one or more inferences.

The invention relates to a dynamic hypergraph hardware accelerator based on an FPGA and an acceleration method. The hardware accelerator comprises a central processing unit and an FPGA processing unit. The central processing unit reads and analyzes the input mode hypergraph to obtain a matching plan and sends the matching plan to the FPGA processing unit; verifying the constraint related to the high-order intersection and the unique mapping condition of the vertex; the FPGA processing unit locates and marks candidate results which are invalid due to updating operation; expanding a neighborhood domain in the data hypergraph by taking the updated edge as an anchor point so as to construct a local dependency subgraph; in the local dependence subgraph range, preposed pruning is carried out based on a matching plan, and multi-constraint screening is executed; performing bitmap intersection operation on the pruned candidate results to perform constraint verification, and discarding the candidate results which do not pass the constraint verification; on the basis of candidate results passing the constraint verification, generating a normalized key to carry out rapid pre-checking, thereby realizing duplicate removal and pre-filtering; and sending the candidate result subjected to duplicate removal and pre-filtering to a central processing unit.

The invention discloses a filtering mechanism based on wafer chemical nickel-palladium-gold plating, and belongs to the technical field of filtering separation, the filtering mechanism comprises a pre-filtering mechanism, the bottom end of the pre-filtering mechanism is provided with a V-shaped flow dividing pipe, and the V-shaped flow dividing pipe is internally provided with a liquid flow channel switching mechanism; the pre-filtering mechanism comprises a filtering cylinder, a flapping and pressing mechanism and an overturning mechanism are arranged in the filtering cylinder, and the outer side of the overturning mechanism is fixedly sleeved with a filtering bag; an electric sliding rail is fixedly mounted on the outer side of the filter cartridge, and a driving rack is fixedly mounted on a sliding block of the electric sliding rail. By arranging the pre-filtering mechanism, the V-shaped flow dividing pipe and the liquid flow channel switching mechanism, multi-stage filtering of a plating solution is achieved, the pre-filtering mechanism can effectively intercept large particles and prevent the large particles from directly entering the precision filter, the burden of the precision filter is remarkably relieved, the service life of a filter element is prolonged, and long-term stable operation of a filtering system is guaranteed.

The invention discloses a filter and a filtering device, which are characterized in that the filter comprises two coaxially arranged filtering layers with hollow cylindrical structures, the two filtering layers comprise a pre-filtering layer and a final filtering layer, and the final filtering layer is coaxially arranged in an inner hole formed by the pre-filtering layer; and the pre-filtering layer and the final filtering layer are independently pleated. According to the invention, the filtering flux and the filtering area are improved, and the filtering effect is improved.