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6233 results about "Filter effect" patented technology

Haze pollutant removing device

The invention relates to the field of air pollutant removing devices, in particular to a haze pollutant removing device which comprises a ventilation system with a fan, an air filter device, purification devices and silencers. The ventilation system with the fan comprises a rainproof haze air inlet, an air pressure equalizing chamber, the fan and an air cleaning static pressure tank type spherical jet air outlet; the air filter device comprises a primary filter, an intermediate filter and a high-efficiency filter; the purification devices include one or a plurality of devices including an alkaline aqueous solution spray washing device, an activated carbon adsorption device, a negative ion purification device, a catalytic combustion purification device, an electrostatic dust collection device, an ultraviolet disinfection device, a photonic hydrogen ion purification device, a biological purification device and a three-way catalytic purification device; the silencers include one or a plurality of devices including a silencer at an induce draft end of the fan, a vibration damping muffler device and a silencer at an exhaust end. The haze pollutant removing device has the advantages that clean air can be exhausted to the atmosphere under the filter effects of filters and purification treatment effects of the various purification devices, and accordingly the purpose of quickly removing haze pollutants can be achieved.
Owner:王全龄

Boiler fuel gas dedusting purifying device

InactiveCN107096361AGood dust removal and filtration effectSpeed up the flowGas treatmentDispersed particle filtrationDrive shaftFlue gas
The invention discloses a boiler fuel gas dedusting purifying device. The boiler fuel gas dedusting purifying device comprises a dedusting chamber; the left side of the dedusting chamber is fixedly provided with an extension board; the extension board is fixedly provided with a driving motor; the driving motor is fixedly provided with a driving shaft; the right end of the driving shaft is fixedly provided with a driving bevel gear; the upper end of a driven shaft is fixedly provided with a driven bevel gear; the driven shaft is fixedly provided with a plurality of blades; the blades are uniformly fixedly arranged on the external surface of the driven shaft along the circumferential direction; two slide bars are arranged on the dedusting chamber; the upper side wall of the dedusting chamber is penetrated by the two slide bars; each of the slide bars is provided with a brushing board; the right side surface of each brushing board is fixedly provided with a hairbrush; the top of the dedusting chamber is provided with a desulphurization tank; one end of a conveyer pipe far from an air pump is provided with an aeration disc; the top of the desulphurization tank is provided with an exhaust pipe. The boiler fuel gas dedusting purifying device is excellent in dedusting filtering effect; flue gas is introduced into the aeration disc for aeration processing, so that sulfides in flue gas are absorbed by a desulfurizer completely, desulphurization effect is excellent; and environment protection emission is realized at last.
Owner:张炳强

Wavelet transform and variable-step-size LMS (least mean square) adaptive filtering based signal denoising method

The invention discloses a wavelet transform and variable-step-size LMS (least mean square) adaptive filtering based signal denoising method which comprises the following steps that: 1, signal receiving and synchronous storage: a data processor synchronously stores received signals into a data memory so as to obtain a sampling sequence X (k) which is a one-dimensional signal; 2, high-frequency signal extraction: the data processor carries out wavelet transform on the currently received one-dimensional signal X (k) and extracts high-frequency signals; and 3, LMS adaptive filtering: the data processor invokes the high-frequency signals extracted by an LMS adaptive filter to carry out LMS error calculation so as to obtain output signals subjected to filtering, and carries out adjustment on the parameters of the filter according to error signals, so that the output signals tend to interference signals. The method disclosed by the invention is simple in steps, reasonable in design, convenient to realize, and good in denoising effect; and the denoising process is performed through the combination of wavelet transform and variable-step-size LMS adaptive filtering, so that the filtering effect and the tracking speed are effectively increased.
Owner:XIAN UNIV OF SCI & TECH

High-temperature resistant fiber filter paper for engine oil filter and preparation method of high-temperature resistant fiber filter paper

The invention discloses high-temperature resistant fiber filter paper for an engine oil filter and a preparation method of the high-temperature resistant fiber filter paper. The high-temperature resistant fiber filter paper comprises, by weight, 60-70 parts of coniferous wood pulp, 20-30 parts of cotton pulp, 20-30 parts of modified polyimide fiber, 2-5 parts of kaoline, 1-3 parts of lithopone, 2-4 parts of silica gel, 1-2 parts of nanometer titania, 0.5-0.8 part of ammonium polyphosphate, 1-2 parts of modified acrylic emulsion, 2-4 parts of acetic styrene-acrylic emulsion, 0.5-1 part of stearic acid monoglyceride, 0.5-1 part of silane coupling agent KH590, 0.4-0.8 part of sodium lauryl sulfate, and 2-5 parts of urea resin. The high-temperature resistant fiber filter paper prepared is good in water permeability, large in filtering area, small in maximum hole diameter, high in filtering precision, strong in bursting strength, high in temperature resistance and the like, has stable performance index under normal-temperature and high-temperature working conditions and is provided with good temperature resistance and filtering effects, and filtering efficiency of the high-temperature resistant fiber filter paper can reach 99.97%.
Owner:ANHUI PHOENIX INT CO LTD

Environment-friendly efficient filter filtering paper and preparation method thereof

The invention discloses an environment-friendly efficient filter filtering paper. The environment-friendly efficient filter filtering paper is prepared by the following raw materials in part by weight: 40-50 parts of softwood pulp, 30-40 parts of waste paper pulp, 20-30 parts of high-silica glass fiber, 2-5 parts of modified vermiculite, 1-3 parts of zeolite molecular sieve, 2-4 parts of nanometer calcium, 1-2 parts of modified pulverized fuel ash, 2-3 parts of water-solubility organic silicon resin emulsion, 1-2 parts of water-solubility polytetrafluoroethylene emulsion, 0.5-0.8 parts of ammonium polyphosphate, 3-4 parts of glycerol triacetate, 0.5-1 parts of diethanolamide, 0.5-1 parts of silane coupling agent KH560, 0.4-0.8 parts of sodium dodecyl sulfate, 0.5-1 parts of antioxidant DSTP, and 4-6 parts of polyethylenimine. The filtering paper prepared by the method provided by the invention has the advantages of being good in water permeability, large in filtering area, small in maximum diameter of hole, high in filtering precision, strong in bursting strength, high-temperature-resistant, good in water resistance and the like, can achieve the filtering efficiency by 99.98%, has stable performance index at atmospheric and high-temperature working conditions, as well as better temperature resistance and filtering effects.
Owner:ANHUI PHOENIX INT CO LTD

Fingerprint image orientation enhancement method

ActiveCN101576999AImprove the defect that the filtering effect is too roughEfficient separationImage enhancementCharacter and pattern recognitionPattern recognitionFilter effect
The invention relates to the field of fingerprint image processing, in particular to a fingerprint image orientation enhancement method. The technical proposal adopted in the invention comprises the following steps of: 1) adding a step of Gabor pre-filtering, adjusting filtering parameters again after conducting preliminary directional filtering enhancement on the original image, and conducting secondary accurate Gabor filtering; and 2) adopting a self-adaptive measure of a Gabor filter transmission band to calculate respective numerical characteristics of the original fingerprint image and the pre-filtered fingerprint image and dynamically adjust the width of the filter transmission band. The fingerprint image orientation enhancement method has the beneficial effects: 1) the method improves the defects of the prior art that filtering is only implemented for once, the filtering parameter is an fixed experience value, and the filtering effect is too rough; 2) fingerprint ridges obviously separate, the edges of the ridges are smooth, the noise points are removed from the fingerprint ridges, and the original features such as scar and the like are kept simultaneously; and 3) compared with the prior art, the uniformity and definition of the fingerprint ridges, the capability of recovering the broken ridges and the like are remarkably improved.
Owner:HANGZHOU SYNOCHIP DATA SECURITY TECH CO LTD

Broadband light source and cascaded optical waveguide filter-based optical sensor

The invention discloses a broadband light source and cascaded optical waveguide filter-based optical sensor. The optical sensor comprises a wideband light source, an input waveguide, a sensing ring-shaped resonant cavity which is coupled with the input waveguide, a connection waveguide which is coupled with the sensing ring-shaped resonant cavity, a reference ring-shaped resonant cavity which is coupled with the connection waveguide, an output waveguide which is coupled with the reference resonant cavity, and two optical power meters, wherein the optical length of the sensing ring-shaped resonant cavity is the same as that of the reference ring-shaped resonant cavity; every resonance frequency of the sensing ring-shaped resonant cavity correspondingly coincides with that of the reference ring-shaped resonant cavity one by one; and at least a part of waveguide in the sensing ring-shaped resonant cavity is subjected to the detected variable influence or at least a part of waveguide cladding is contacted with the detected materials. As the movement which is caused by the detected variable influence or the change of the detected materials can be converted into the change of total transmission output power by using the cascaded filter effect of an isometric double resonant cavity, the measured quantity is simply and effectively detected.
Owner:浙江光尖电子技术有限公司

Leaching device used in vertical transfer of pollutants in soil

InactiveCN102411043AReduce the impact of horizontal migrationPrecise control of flow rateEarth material testingSpray nozzleWater flow
The invention relates to a leaching device used in vertical transfer of pollutants in soil. The leaching device comprises a spray nozzle, a water flow meter, a leaching column for holding an experimental earth pillar and a percolate accommodating container, wherein, the leaching column is internally provided with at least two filter layers capable of filtering leaching liquid, a filter layer structure is respectively arranged on the upper and lower ends of the experimental earth pillar, and each filter layer is provided with a filter screen layer, a filter bulb layer and a filter paper layer; and in addition, the height of the leaching column body is 90cm-150cm, and the inner diameter of the cross section of the column body is 5cm-15cm. The leaching device has the advantages that on the basis of the large axial size of the leaching column, vertical transfer of the pollutants in the profile of the deeper soil can be simulated; by setting the water flow meter, the flow velocity and flow rate of injection water can be accurately controlled; by setting the upper filter layer, the injection water can be uniformly sprayed; and by setting the lower filter layer, the filter effect can be ensured and percolate can be timely and effectively discharged.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)

Micro inertial parameter adaptive attitude determination method based on carrier flight mode judgment

The invention discloses a micro inertial parameter adaptive attitude determination method based on carrier flight mode judgment. The method comprises the following steps of outputting data by a sensor; calculating a long-period characteristic parameter and a short-period characteristic parameter of the sensor; judging a motion mode of a carrier according to the variation and range of the parameters; designing an adaptive adjustment strategy of a kalman filtering parameter according to the error variation characteristics of a micro attitude reference system of the carrier in different motion modes; observing the variation of residual sequence quadratic sum according to the attitude in a kalman filter; and carrying out online difference evaluation for the quality of filter effect of the current parameter, and feeding back the evaluation result in a form of parameter confidence to adjust a filter parameter of the kalman filter. According to the method, selection and setting operations of a judgment threshold in the conventional micro inertial attitude determination method are simplified, the influence of the flying height of the carrier and drifting error of the sensor on a judgment condition is avoided, dynamic and static running characteristics of the micro attitude reference system are considered comprehensively, and the dynamic adaptability and the static stability of the micro attitude reference system are improved effectively.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

High-precision radial adjustable involute master of gear and adjusting method

The invention discloses a high-precision radial adjustable involute master of gear and an adjusting method. One tooth face of four tooth faces is selected to be not precisely ground, has higher tooth profile shape deviation and is used for detecting a frequency response characteristic, a filtering effect and sensitivity of an instrument; another three tooth faces are precisely processed and have smaller tooth profile shape deviation, one precisely processed surface has certain tooth profile slope deviation and is used for detecting an amplification factor of the instrument, and other two tooth faces on opposite sides have tooth profile slope deviation which is approximate to zero and are used for representing the precision grade of the involute master of gear, transmitting involute parameter values and determining and correcting an indication error of an involute measurement instrument. The high-precision radial adjustable involute master of gear is simple in structure, convenient to adjust, high in connecting rigidity and reliable in connection with a master core shaft and high in precision, has a stable size, and can simultaneously meet demands for frequency response characteristic, filtering effect, sensitivity, amplification factor detection and instrument indication error correction of the involute measuring instrument.
Owner:DALIAN UNIV OF TECH
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