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单词 filter
释义

filter


fil·ter

F0122400 (fĭl′tər)n.1. a. A porous material through which a liquid or gas is passed in order to separate the fluid from suspended particulate matter.b. A device containing such a material, especially one used to extract impurities from air or water.2. a. Any of various electric, electronic, acoustic, or optical devices used to reject signals, vibrations, or radiations of certain frequencies while allowing others to pass.b. A colored glass or other transparent material used to select the wavelengths of light allowed to reach a photosensitive material. 3. Computers A program or device that blocks email or restricts website access when specific criteria are met.4. Informal The ability or tendency to censor oneself, as to avoid causing embarrassment or offense: My roommate has no filter and says whatever he's thinking at the moment.v. fil·tered, fil·ter·ing, fil·ters v.tr.1. To pass (a liquid or gas) through a filter.2. To remove by passing through a filter: filter out impurities.3. Computers To use a filter to block or restrict access to: a program that filters spam.4. Informal To censor (oneself), as to avoid causing embarrassment or offense.v.intr.1. To pass through or as if through a filter: Light filtered through the blinds.2. To come or go gradually and in small groups: The audience filtered back into the hall.
[Middle English filtre, from Old French, from Medieval Latin filtrum, of Germanic origin; see pel- in Indo-European roots.]
fil′ter·er n.fil′ter·less adj.

filter

(ˈfɪltə) n1. (Chemistry) a porous substance, such as paper or sand, that allows fluid to pass but retains suspended solid particles: used to clean fluids or collect solid particles2. (Chemistry) any device containing such a porous substance for separating suspensions from fluids3. (Brewing) any of various porous substances built into the mouth end of a cigarette or cigar for absorbing impurities such as tar4. (General Physics) any electronic, optical, or acoustic device that blocks signals or radiations of certain frequencies while allowing others to pass. See also band-pass filter5. (Photography) any transparent disc of gelatine or glass used to eliminate or reduce the intensity of given frequencies from the light leaving a lamp, entering a camera, etc6. (Automotive Engineering) Brit a traffic signal at a road junction consisting of a green arrow which when illuminated permits vehicles to turn either left or right when the main signals are redvb7. (Chemistry) (often foll by out) to remove or separate (suspended particles, wavelengths of radiation, etc) from (a liquid, gas, radiation, etc) by the action of a filter8. (tr) to obtain by filtering9. (foll by: through) to pass (through a filter or something like a filter): dust filtered through the screen. 10. (intr) to flow slowly; trickle[C16 filtre from Medieval Latin filtrum piece of felt used as a filter, of Germanic origin; see felt2]

fil•ter

(ˈfɪl tər)

n. 1. any substance, as cloth, paper, porous porcelain, or charcoal, through which liquid or gas is passed to remove suspended impurities or to recover solids. 2. any device, as a tank or tube, containing such a substance for filtering. 3. any of various analogous devices, as for removing dust from air or impurities from tobacco smoke. 4. Informal. a filter-tipped cigarette or cigar. 5. a lens screen of dyed gelatin or glass used in photography to control the rendering of color or to diminish the intensity of light. 6. an electronic circuit or device that passes certain frequencies and blocks others. v.t. 7. to remove by the action of a filter. 8. to act as a filter for; to slow or partially obstruct the passage of. 9. to pass through or as if through a filter. v.i. 10. to pass or slip through slowly, as through an obstruction or a filter; penetrate. [1375–1425; late Middle English filtre < Medieval Latin filtrum felt, piece of felt used to strain liquids < Germanic; see felt2] fil′ter•er, n.

fil·ter

(fĭl′tər)1. A material that has very tiny holes and is used to separate out solid particles contained in a liquid or gas that is passed through it.2. A device that allows certain frequencies of energy waves to pass while blocking the passage of others. For example, filters on photographic lenses allow only certain frequencies of light to enter the camera.

filter

In electronics, a device which transmits only part of the incident energy and may thereby change the spectral distribution of energy: a. High pass filters transmit energy above a certain frequency; b. Low pass filters transmit energy below a certain frequency; c. Band pass filters transmit energy of a certain bandwidth; d. Band stop filters transmit energy outside a specific frequency band.

filter


Past participle: filtered
Gerund: filtering
Imperative
filter
filter
Present
I filter
you filter
he/she/it filters
we filter
you filter
they filter
Preterite
I filtered
you filtered
he/she/it filtered
we filtered
you filtered
they filtered
Present Continuous
I am filtering
you are filtering
he/she/it is filtering
we are filtering
you are filtering
they are filtering
Present Perfect
I have filtered
you have filtered
he/she/it has filtered
we have filtered
you have filtered
they have filtered
Past Continuous
I was filtering
you were filtering
he/she/it was filtering
we were filtering
you were filtering
they were filtering
Past Perfect
I had filtered
you had filtered
he/she/it had filtered
we had filtered
you had filtered
they had filtered
Future
I will filter
you will filter
he/she/it will filter
we will filter
you will filter
they will filter
Future Perfect
I will have filtered
you will have filtered
he/she/it will have filtered
we will have filtered
you will have filtered
they will have filtered
Future Continuous
I will be filtering
you will be filtering
he/she/it will be filtering
we will be filtering
you will be filtering
they will be filtering
Present Perfect Continuous
I have been filtering
you have been filtering
he/she/it has been filtering
we have been filtering
you have been filtering
they have been filtering
Future Perfect Continuous
I will have been filtering
you will have been filtering
he/she/it will have been filtering
we will have been filtering
you will have been filtering
they will have been filtering
Past Perfect Continuous
I had been filtering
you had been filtering
he/she/it had been filtering
we had been filtering
you had been filtering
they had been filtering
Conditional
I would filter
you would filter
he/she/it would filter
we would filter
you would filter
they would filter
Past Conditional
I would have filtered
you would have filtered
he/she/it would have filtered
we would have filtered
you would have filtered
they would have filtered

filter

A device containing a porous material, for example, paper or sand, which can remove suspended solid particles from a fluid.
Thesaurus
Noun1.filter - device that removes something from whatever passes through itfilter - device that removes something from whatever passes through itair cleaner, air filter - a filter that removes dust from the air that passes through itbacteria bed - layer of sand or gravel used to expose sewage effluent to air and the action of microorganismscoffee filter - filter (usually of paper) that passes the coffee and retains the coffee groundsdevice - an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water"drain basket - a filter in a sink drain; traps debris but passes waterfilter bed - filter consisting of a layer of sand or gravel for filtering waterfuel filter - a filter in the fuel line that screens out dirt and rust particles from the fueldiffusing screen, light filter - a transparent filter that reduces the light (or some wavelengths of the light) passing through itoil filter - a filter that removes impurities from the oil used to lubricate an internal-combustion enginestrainer - a filter to retain larger pieces while smaller pieces and liquids pass throughwater filter - a filter to remove impurities from the water supplyglass wool - glass fibers spun and massed into bundles resembling wooldiatomaceous earth, diatomite, kieselguhr - a light soil consisting of siliceous diatom remains and often used as a filtering material
2.filter - an electrical device that alters the frequency spectrum of signals passing through itelectrical device - a device that produces or is powered by electricityhigh-pass filter - a filter that passes frequencies above a certain value and attenuates frequencies below that valuelow-pass filter - a filter that passes frequencies below a certain value and attenuates frequencies above that value
Verb1.filter - remove by passing through a filter; "filter out the impurities"filter out, filtrate, separate out, strainseparate - divide into components or constituents; "Separate the wheat from the chaff"
2.filter - pass through; "Water permeates sand easily"permeate, sink in, percolatepenetrate, perforate - pass into or through, often by overcoming resistance; "The bullet penetrated her chest"infiltrate - pass into or through by filtering or permeating; "the substance infiltrated the material"infiltrate - cause (a liquid) to enter by penetrating the interstices
3.filter - run or flow slowly, as in drops or in an unsteady streamfilter - run or flow slowly, as in drops or in an unsteady stream; "water trickled onto the lawn from the broken hose"; "reports began to dribble in"dribble, tricklecourse, flow, run, feed - move along, of liquids; "Water flowed into the cave"; "the Missouri feeds into the Mississippi"percolate, leach - permeate or penetrate gradually; "the fertilizer leached into the ground"

filter

verb1. purify, treat, strain, refine, riddle, sift, sieve, winnow, filtrate, screen The best prevention for cholera is to filter water.2. trickle, leach, seep, percolate, well, escape, leak, penetrate, ooze, dribble, exude Water filtered through the peat.3. seep, trickle, percolate, reach gradually The news began to filter through to the politicians.noun1. sieve, mesh, gauze, strainer, membrane, riddle, sifter a paper coffee filter
Translations
过滤过滤器慢慢传开滤光器滤色镜

filter

(ˈfiltə) noun1. a strainer or other device through which liquid, gas, smoke etc can pass, but not solid material. A filter is used to make sure that the oil is clean and does not contain any dirt; (also adjective) filter paper. 過濾器 过滤器2. a kind of screening plate used to change or correct certain colours. If you are taking photographs in sun and snow, you should use a blue filter. 濾色鏡，濾光器 滤色镜，滤光器 verb1. (of liquids) to (become) clean by passing through a filter. The rain-water filtered into a tank. 過濾 过滤2. to come bit by bit or gradually. The news filtered out. 慢慢傳開 慢慢传开ˌfilter-ˈtip noun (a cigarette with) a filter. 香煙的濾嘴 香烟的过滤咀

filter

→ 过滤zhCN, 过滤器zhCN

filter


filter down

1. Of a liquid, to slowly seep down through lower substrate levels. The company bottles rainwater that has filtered down through seven layers of volcanic rock, purifying it and enriching it with minerals.2. By extension, of information, resources, communication, etc., to move slowly and in small amounts down to lower levels of people in an organization, population, or group. It always takes a dog's age for any important company information to filter down to me and the other interns. The government has approved a staggering $200 billion stimulus package, but some experts warn it could be years before that money filters down to individuals and smaller businesses.See also: down, filter

filter up

Of information, resources, communication, etc., to move slowly and in small amounts up to higher levels of people in an organization, population, or group. Local think-tanks are developing new, pragmatic strategies to deal with the burgeoning housing crisis, but they are unlikely to filter up to the agenda of state lawmakers anytime soon.See also: filter, up

#nofilter

A common hashtag on the social media and photo-sharing platform Instagram for pictures that have not been altered with the variety of filters offered in the app. What a gorgeous sunset tonight. #nofilter

filter out

1. To use a filtration device or system to remove something from something else. A noun or pronoun can be used between "filter" and "out." These noise-canceling headphones were great at filtering all the background noise out during my flight to New York. We can use this machine to filter out anything that might pollute the water sample.2. To keep something from being known or experienced. A noun or pronoun can be used between "filter" and "out." Your job is to scan the user forum and filter out any offensive posts. You can't just filter negative feedback out from the "Reviews" page. Customers deserve to see the whole picture!See also: filter, out

filter through (something)

To move or pass through some thing. No, it won't be too dark in here—a good amount of light will still filter through these sheer curtains.See also: filter, through

bozo filter

A filter that one can enable in an email account to prevent correspondence from someone irritating or obnoxious. Wow, that was rude—I'm definitely adding him to my bozo filter now.See also: bozo, filter

filter in(to) (some place)

1. To slowly pass or diffuse into some place. The sunlight filtering into my bedroom is what eventually woke me up.2. To slowly or gradually enter some place. There's no set start time for the event—people just filter in all day long.See also: filter

filter (something) out of (something)

To use a filter to remove something from something else, usually a liquid. We can use this machine to filter any pollutants out of the water sample.See also: filter, of, out

filter in

 (to some place) 1. Lit. to leak or seep into some place. The smell of bacon cooking filtered into his room and made him wake up. The smoke filtered in and burned our eyes. 2. Fig. [for people] to come into a place, a few at a time, over a period of time. One by one, the guests filtered into the room. They filtered in and started on the snacks.See also: filter

filter something out of something

 and filter something outto remove something from a fluid by running it through a filter. We filtered the odors out of the water and made it fit to drink. I'm glad you filtered out the odor.See also: filter, of, out

filter through (something)

to pass or seep through something. The water filtered through the coffee grounds and dripped into the pot. The clear water filtered through and left the sand behind.See also: filter, through

filter down

v. To pass or spread downward from an upper level to lower levels, as through a filter: The information slowly filtered down from management to the hourly employees.See also: down, filter

filter out

v. To prevent something from passing through, being communicated, or being perceived: My new glasses filter out ultraviolet rays. These headphones filter unwanted noise out.See also: filter, out

filter through

v. To be allowed to pass through something or to find a way through something, especially an obstacle: The sunlight filtered through the thin curtains.See also: filter, through

bozo filter

n. a setting on an internet email reader that will filter out selected annoying people. (Refers to bozo, a jerk.) Welcome to my bozo filter, jerk! See also: bozo, filter

filter


filter

1. a porous substance, such as paper or sand, that allows fluid to pass but retains suspended solid particles: used to clean fluids or collect solid particles 2. any device containing such a porous substance for separating suspensions from fluids 3. any of various porous substances built into the mouth end of a cigarette or cigar for absorbing impurities such as tar 4. any electronic, optical, or acoustic device that blocks signals or radiations of certain frequencies while allowing others to pass 5. any transparent disc of gelatine or glass used to eliminate or reduce the intensity of given frequencies from the light leaving a lamp, entering a camera, etc. 6. Brit a traffic signal at a road junction consisting of a green arrow which when illuminated permits vehicles to turn either left or right when the main signals are red

filter

A device that transmits part of a received signal and rejects the rest. The signal may be in the form of a beam of light or other radiation or may be an electrical signal. Optical, ultraviolet, and infrared filters are dyed plastic or gelatin, glass or glasslike substances, or confined liquids, all of which absorb incident radiation except for a relatively narrow band of wavelengths. Such filters are used in astronomical photometry, especially in measurements of magnitudes; transmitting bands typically 100 nanometers wide, they are termed broadband filters. Much narrower wavelength bands, of maybe 1 nm, can be obtained with interference and birefringent filters.

Electrical filters are devices whose attenuation varies with frequency. Filters that allow low or high frequencies to pass without serious attenuation are called low-pass and high-pass filters, respectively. A filter that allows only a limited range of frequencies through is a band-pass filter while its converse is a band-stop filter. See also bandwidth.

Filter

 

in laboratory practice, a device used to separate suspensions into the fluid and solid phases or to determine such filtration parameters as the flow rate, the flow resistance of the filter medium and the filter cake, and the compressibility of the cake. When used to determine filtration parameters, a filter designed for laboratory filtration operates like a filter intended for industrial filtration.

A filter used for laboratory filtration consists of a glass vessel, such as a tube or a funnel, that either is sealed near the base by a filter medium made of porous glass or has a perforated bottom covered on top by filter paper, a filter cloth, a filter screen, or some other filter medium. During laboratory filtration, the pressure drop between the two sides of the filter medium is either kept constant or increased at a specific rate.

REFERENCES

Alekseev, V. N. Kolichestvennyi analiz, 4th ed. Moscow, 1972.
See also references under .

Filter

 

a device that accomplishes by means of a filter medium, or septum, the separation, thickening, or clarification of heterogeneous systems containing a solid phase and a liquid or gaseous phase. The term “filter” is also applied to a number of other devices, which are not discussed in the present article. For example, devices that pass or reject acoustic or electromagnetic waves of certain frequencies are called filters, and the term is sometimes applied to devices that separate polymer ions into fractions or remove salts from solutions by means of ion exchangers.

According to the nature of the heterogeneous system, a distinction is made between liquid filters, which are used to filter suspensions, and gas filters, which are used to separate out aerosols and to purify gases. The simplest filter is a vessel that is divided into two parts by a filter medium. A pressure difference is established across the filter to force the liquid or gas through the filter medium, which holds back the solid particles.

Liquid filters. Liquid filters are divided according to their method of operation into two groups: filters that operate intermittently, that is, on a batch basis, and filters that operate continuously. Within each group, filters are classified according to the way the pressure difference is created (application of vacuum or pressure), the geometry of the filtering surface (plane or curvilinear), and the type of filter medium used. In an intermittent filter the entire surface of the filter medium is subjected by turns to the following operations: influx of a slurry and formation of a cake (filtration), dewatering, washing and discharge of the cake, and regeneration of the filter medium. In a continuous filter these operations occur simultaneously and independently of one another in an appropriate filter zone.

The intermittent group includes filter presses and capacity, leaf, and cartridge filters.

Capacity filters are used to separate small quantities of suspensions. The filter may be operated by vacuum, as in vacuum

Figure 1. Schematic of a cartridge filter: (1) housing, (2) filter medium, (3) top, (4) grating, (5) hinged bottom

Nutsche filters, or by pressure. The housing of the filter may be open or closed. The filter medium is located on a perforated support at the bottom of the filter. The slurry is admitted to the upper part of the filter, and the filtrate is drained from the lower part. In filters with mechanized discharging the cake is removed through a hinged bottom; in those with an open housing the cake is removed by tilting or by hand.

Leaf filters are used to clarify solutions and to separate slurries that contain no more than 5 percent (by volume) of a solid phase. The filter elements, or leaves, are circular or rectangular in shape and are usually covered with a cloth filter medium. Each leaf has an outlet through which the filtrate is discharged. The slurry is fed into the filter tank. The layer of cake is washed after all the slurry has been removed from the tank.

Filter presses are used chiefly for fine slurries. They include plate-and-frame presses, chamber presses, and automatic filter presses.

A plate-and-frame filter press consists of an assembly of alternating vertical plates and frames. Compression of the assembly is accomplished by a hand screw or a hydraulic or electromechanical closing device. The frames form hollow chambers, into which the slurry is fed when the filter is in operation. The filter medium is laid over each plate, whose faces are ribbed to provide drainage. Under pressure, the filtrate passes through the filter media, runs down the ribbed surface of the plates, and passes through the filtrate outlets to an open launder or a closed channel. The cake formed in the chambers is removed by separating the plates.

The chamber filter press operates in a manner similar to that of the plate-and-frame filter press but permits higher pressures.

In automatic chamber filter presses the filter plates are located between two supporting plates and are positioned horizontally at a certain distance from one another. The top of each filter plate is covered with a perforated sheet, over which an endless-belt filter medium is located. When the plates are compressed, chambers are formed between them. The slurry, wash liquid, and compressed air (for drying) are successively fed into the chambers from the corresponding channels. The filtrate passes through the filter medium, and the solid phase remains on it in the form of a cake. Upon completion of the filtration cycle, the plates are separated, a gap opens up between them, and the filter medium is set in motion. The cake is carried out from between the plates and is removed with scrapers. The filter operates automatically and is four to ten times more efficient than the plate-and-frame filter press.

Cartridge filters (Figure 1) are used for clarifying or thickening slurries. Such filters are operated by vacuum or by pressure. The housing of the filter has a top and a bottom and contains a grating, on which the filter medium, in the form of a cartridge, is

Figure 2. Disk-type rotary vacuum filter: (1) section, (2) disk, (3) distributor, (4) pipe for vacuum connection and filtrate removal, (5) pipes for application of compressed air, (6) scraper for cake discharge

mounted. Cartridge filters usually have several dozen such cartridges. The cake is discharged by means of an air blast or pneumohydraulic shock or through the use of vibration apparatus.

Continuous filters include drum, disk, belt, rotating-pan, and tilting-pan types.

Rotary-drum vacuum filters have found the broadest application in industry (seeVACUUM FILTER).

Disk-type rotary vacuum filters (Figure 2) are used for slurries having solid particles that are similar in size. Such filters have a more complicated filtering surface than do rotary-drum vacuum filters. A typical disk-type filter consists of vertical disks mounted on a horizontal hollow shaft that is divided into sections. The shaft and disks rotate in a tank shaped like a semicyiinder and filled with the slurry to be separated. Each disk consists of hollow sectors, on which the filter media are stretched. Both sides of each sector are perforated or ribbed. The interior of each sector connects to a drainage channel for removal of the filtrate. For discharge of the cake, a blast of air is applied to inflate the filter bag; scrapers and discharge rolls are used to detach the cake and guide the discharge.

Belt vacuum filters (Figure 3) are used for slurries forming a heavy cake that has particles of different sizes and that requires thorough washing. The filter contains suction boxes for removal of the filtrate and wash liquid. The filter medium, usually cloth, is carried by a rubberized perforated belt, which encircles two drums. The cake is discharged when the belt and filter medium move down around the end drum. During the return of the belt the filter medium is cleaned by means of brushes or steam jets.

Figure 3. Belt vacuum filter: (1) tension drum, (2) table, (3) suction boxes, (4) endless rubberized belt, (5) driving drum, (6) endless filter cloth, (7) slurry feed chute, (8) spray pipes

The principal application of the rotating-pan filter (Figure 4) is the dewatering of coarse slurries in, for example, the production of potassium and the preparation of hard coal and ores. The device is a vacuum filter. The filter surface is annular in shape and is divided into trapezoidal segments, each of which constitutes a filter cell. The upper part of each cell is open, and the bottom is inclined toward the center to facilitate the flow of liquid. The cell is covered by a perforated sheet, on which the filter medium is placed. The interior of each segment is connected by pipes to the channels of a distribution system, which is rigidly fastened to the housing. The filter is rotated by an electric motor. During one rotation a filter cell is successively connected to vacuum and compressed-air lines. The slurry is fed into the cell from above. The cake is removed with a scraper or a screw conveyor.

Tilting-pan filters are used for coarse slurries. They are operated by vacuum and consist of trapezoidally shaped pans held in an annular frame. The pans are connected by pipes to a distributor, through which the filtrate and wash liquid are removed. The pans revolve as a unit around a vertical axis. Each pan consists of a shell, which, together with the drainage plates and filter medium, constitutes the working element of the filter. The slurry and wash liquid are fed into the pan from above. For discharge of the cake, the pan is automatically rotated by 180° when it is above the discharge site.

Gas filters. Gas filters are continuously operating devices. They may be divided according to their structure into two groups: filters having a plane filtering surface and bag, or fabric, filters.

The filters of the first group consist of a chamber that is divided by one or two perforated plates. In the case of one plate, the filter medium—which may be, for example, sand or quartz—is placed on the plate. In the case of two plates, a compressed fibrous material—such as asbestos fiber, glass fiber, or glass wool—is clamped between the plates, which are attached to each other. When the gas flows through the filter medium, the particles suspended in the gas are removed. At certain time intervals the filter medium is cleaned or replaced.

Figure 4. Rotating-pan filter: (1) filter cell, (2) connecting pipe, (3) device for removing cracks in cake, (4) device for distributing wash liquid, (5) cake-removal device, (6) rim

The filter medium of a bag filter is in the form of cloth or felt bags. The gas flowing into the filter is distributed among the bags. The particles removed from the gas are deposited on the inner surfaces of the bags, and the clean gas leaves the filter through a special outlet. The layer of deposited particles is removed by a bag-shaking mechanism and dumped into the lower part of the filter; then it is removed from the apparatus with a screw conveyor. Cartridge filters are also used as bag filters for cleaning gases.

REFERENCES

Vettsel’, B. Noveishie konstruktsii fil’trov. Moscow, 1965.
Fil’try dlia zhidkostei. Moscow, 1965.
Planovskii, A. N., and P. I. Nikolaev. Protsessy i apparaty khimicheskoi i neftekhimicheskoi tekhnologii, 2nd ed., Moscow, 1972.
Mashiny i apparaty khimicheskikh proizvodstv, 3rd ed. Edited by I. I. Chemobyl’skii. Moscow, 1975.

A. F. KUDRIASHOV

filter

[′fil·tər] (computer science) A device or program that separates data or signals in accordance with specified criteria. (control systems) compensator (electronics) Any transmission network used in electrical systems for the selective enhancement of a given class of input signals. Also known as electric filter; electric-wave filter. (engineering) A porous article or material for separating suspended particulate matter from liquids by passing the liquid through the pores in the filter and sieving out the solids. (engineering acoustics) A device employed to reject sound in a particular range of frequencies while passing sound in another range of frequencies. Also known as acoustic filter. (mathematics) A family of subsets of a set S : it does not include the empty set, the intersection of any two members of the family is also a member, and any subset of S containing a member is also a member. (optics) An optical element that partially absorbs incident electromagnetic radiation in the visible, ultraviolet, or infrared spectra, consisting of a pane of glass or other partially transparent material, or of films separated by narrow layers; the absorption may be either selective or nonselective with respect to wavelength. Also known as optical filter. (science and technology) In general, a selective device that transmits a desired range of matter or energy while substantially attenuating all other ranges.

filter

1. A device to separate solids, such as dust, from air. 2. A device to separate solids from liquids. 3. A charcoal filter. 4. A layer or combination of layers of pervious materials designed and installed in such a manner as to provide drainage, yet prevent the movement of soil particles due to flowing water. 5.See heat filter.6. See light filter.

filter

i. A device to trap and hold all impurities or solids beyond a specific thickness. The thicknesses of impurities are measured in microns. See fuel filter. See also micron (i).
ii. To study all information and discard what is irrelevant.
iii. A device for discriminating between currents of different frequencies, selecting some frequency bands and rejecting interference from other frequencies. A band-pass filter has a single transmission band. A high-pass filter passes currents with frequencies higher than a nominal cut-off frequency, and it highly attenuates those with frequencies below. A low-pass filter works in the opposite manner. See also bandpass.

filter

(1)(Originally Unix, now also MS-DOS) A program thatprocesses an input data stream into an output data stream insome well-defined way, and does no I/O to anywhere else exceptpossibly on error conditions; one designed to be used as astage in a pipeline (see plumbing). Compare sponge.

filter

(2)(functional programming) A higher-order function whichtakes a predicate and a list and returns those elements ofthe list for which the predicate is true. In Haskell:

filter p [] = []filter p (x:xs) = if p x then x : rest else restwhererest = filter p xs

See also filter promotion.

filter

(1) See packet filter and filter bubble.

(2) To select data. Filters use patterns (masks) against which all data are compared and only matching data are "passed through," hence the concept of a filter. For example, email clients and servers can look for messages with text patterns that are recognized as spam and delete them. An email client can be set up to filter messages and store them in separate mailboxes as a way of organizing the mail, or it can be set to alert the user when a certain type of message arrives. See Bayesian filtering, spam filter and algorithmic filter.

(3) To change data. In this usage of the term, the concept of a filter (pass-through device) is less obvious, but nevertheless widely used. For example, a sort routine changes the sequence of data. A conversion routine (import or export filter) changes one type of data, text or graphics format into another. See image filter and parse.
See filter

Filter


Filter

A rule that stipulates when a security should be bought or sold according to its price action.

Filter Rule

In technical analysis, an arbitrarily set percentage of increase or decline in a stock's price that the analyst sees as an indicator to buy or sell the stock. For example, the analyst may set his/her own filter rule at 15%. If the stock rises 15%, the analyst recommends buying; if it falls 15%, he/she recommends selling. While the particular percentage is subjective, one arrives at it by observing the stock's historical trends. The filter rule exists to help the investor avoid buying or selling at insignificant or anomalous changes in price. However, many analysts do not believe that the filter rule consistently produces profits for the investor.
See FAST Information List

FILTER


AcronymDefinition
FILTER➣Focusing Images for Learning and Teaching an Enriched Resource (database; UK)
FILTER➣Filtration and Irrigated Cropping for Land Treatment and Effluent Reuse

filter


  • all
  • verb
  • noun

Synonyms for filter

verb purify

Synonyms

  • purify
  • treat
  • strain
  • refine
  • riddle
  • sift
  • sieve
  • winnow
  • filtrate
  • screen

verb trickle

Synonyms

  • trickle
  • leach
  • seep
  • percolate
  • well
  • escape
  • leak
  • penetrate
  • ooze
  • dribble
  • exude

verb seep

Synonyms

  • seep
  • trickle
  • percolate
  • reach gradually

noun sieve

Synonyms

  • sieve
  • mesh
  • gauze
  • strainer
  • membrane
  • riddle
  • sifter

Synonyms for filter

noun device that removes something from whatever passes through it

Related Words

  • air cleaner
  • air filter
  • bacteria bed
  • coffee filter
  • device
  • drain basket
  • filter bed
  • fuel filter
  • diffusing screen
  • light filter
  • oil filter
  • strainer
  • water filter
  • glass wool
  • diatomaceous earth
  • diatomite
  • kieselguhr

noun an electrical device that alters the frequency spectrum of signals passing through it

Related Words

  • electrical device
  • high-pass filter
  • low-pass filter

verb remove by passing through a filter

Synonyms

  • filter out
  • filtrate
  • separate out
  • strain

Related Words

  • separate

verb pass through

Synonyms

  • permeate
  • sink in
  • percolate

Related Words

  • penetrate
  • perforate
  • infiltrate

verb run or flow slowly, as in drops or in an unsteady stream

Synonyms

  • dribble
  • trickle

Related Words

  • course
  • flow
  • run
  • feed
  • percolate
  • leach
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英语词典包含2567994条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。

　

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更新时间：2024/12/24 10:03:17