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Что (кто) такое fixed-bed filter - определение
SAND
Bacteria bed; Filter sand; Filter beds; Filter bed
![Sand filters on a tomato farm in [[California]]](https://commons.wikimedia.org/wiki/Special:FilePath/20150415-NRCS-LSC-0526 (20027438519).jpg?width=200 "Sand filters on a tomato farm in [[California]]")
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filter bed
¦ noun a tank or pond containing a layer of sand or gravel, used for filtering large quantities of liquid.
Photographic filter
![The 80A filter, mainly used to correct for the excessive redness of [[tungsten]] lighting, can also be used to oversaturate scenes that already have blue. The photo on the left was shot with a polarizer, while the one on the right was shot with a polarizer and an 80A filter.](https://commons.wikimedia.org/wiki/Special:FilePath/80a comparison.jpg?width=200 "The 80A filter, mainly used to correct for the excessive redness of [[tungsten]] lighting, can also be used to oversaturate scenes that already have blue. The photo on the left was shot with a polarizer, while the one on the right was shot with a polarizer and an 80A filter.")
![The ''LOMO effect'' imitates photos made with a low-cost Russian camera brand, named "LOMO". It is approximated by saturated central colors, blurred periphery, and darkened corners and edges ([[vignetting]]).}} effect.](https://commons.wikimedia.org/wiki/Special:FilePath/Verblühende Sauerkirsche.jpg?width=200 "The ''LOMO effect'' imitates photos made with a low-cost Russian camera brand, named \"LOMO\". It is approximated by saturated central colors, blurred periphery, and darkened corners and edges ([[vignetting]]).}} effect.")
CAMERA ACCESSORY CONSISTING OF AN OPTICAL FILTER
Daylight filter; Filter (photography); Lens filter; Filter ring; Filter mount; Filter thread; Cross screen filter; Photographic filters; Red Black and White filter; Camera filter; Series filter
In photography and cinematography, a filter is a camera accessory consisting of an optical filter that can be inserted into the optical path. The filter can be of a square or oblong shape and mounted in a holder accessory, or, more commonly, a glass or plastic disk in a metal or plastic ring frame, which can be screwed into the front of or clipped onto the camera lens.
Elliptic filter
.svg?width=200 "The frequency response of a fourth-order elliptic low-pass filter with '''ε''' = 0.5 and '''ξ''' = 1.05. Also shown are the minimum gain in the passband and the maximum gain in the stopband, and the transition region between normalized frequency 1 and '''ξ'''")
.svg?width=200 "A closeup of the transition region of the above plot.")
![Log of the absolute value of the gain of an 8th order elliptic filter in [[complex frequency space]] (s = σ + jω) with ε = 0.5, ξ = 1.05 and ω<sub>0</sub> = 1. The white spots are poles and the black spots are zeroes. There are a total of 16 poles and 8 double zeroes. What appears to be a single pole and zero near the transition region is actually four poles and two double zeroes as shown in the expanded view below. In this image, black corresponds to a gain of 0.0001 or less and white corresponds to a gain of 10 or more.](https://commons.wikimedia.org/wiki/Special:FilePath/Elliptic Filter s-Plane Response (8th Order).svg?width=200 "Log of the absolute value of the gain of an 8th order elliptic filter in [[complex frequency space]] (s = σ + jω) with ε = 0.5, ξ = 1.05 and ω<sub>0</sub> = 1. The white spots are poles and the black spots are zeroes. There are a total of 16 poles and 8 double zeroes. What appears to be a single pole and zero near the transition region is actually four poles and two double zeroes as shown in the expanded view below. In this image, black corresponds to a gain of 0.0001 or less and white corresponds to a gain of 10 or more.")
.svg?width=200 "An expanded view in the transition region of the above image, resolving the four poles and two double zeroes.")
SIGNAL PROCESSING FILTER
Cauer filter; Elliptical filter; Equiripple filter; Eliptic filter
An elliptic filter (also known as a Cauer filter, named after Wilhelm Cauer, or as a Zolotarev filter, after Yegor Zolotarev) is a signal processing filter with equalized ripple (equiripple) behavior in both the passband and the stopband. The amount of ripple in each band is independently adjustable, and no other filter of equal order can have a faster transition in gain between the passband and the stopband, for the given values of ripple (whether the ripple is equalized or not).
Electronic filter
![A low-pass electronic filter realised by an [[RC circuit]]](https://commons.wikimedia.org/wiki/Special:FilePath/1st Order Lowpass Filter RC.svg?width=200 "A low-pass electronic filter realised by an [[RC circuit]]")
ELECTRONIC CIRCUIT THAT REMOVES UNWANTED COMPONENTS FROM THE SIGNAL, OR ENHANCES WANTED ONES, OR BOTH
Electronic filters; Filter (circuits); Pi filter; Pi Filter; Frequency filter; BAW filter
Electronic filters are a type of signal processing filter in the form of electrical circuits. This article covers those filters consisting of lumped electronic components, as opposed to distributed-element filters.
Optical filter
![Coloured and [[neutral-density filter]]s](https://commons.wikimedia.org/wiki/Special:FilePath/Filter-optics-1.jpg?width=200 "Coloured and [[neutral-density filter]]s")
DEVICE THAT SELECTIVELY TRANSMITS LIGHT OF CERTAIN WAVELENGTHS
Optic filter; Wedge filter; Glass filter; Optical Filters; Optical band-pass filter; Optical bandpass filter; Filter (optics); Light filter
An optical filter is a device that selectively transmits light of different wavelengths, usually implemented as a glass plane or plastic device in the optical path, which are either dyed in the bulk or have interference coatings. The optical properties of filters are completely described by their frequency response, which specifies how the magnitude and phase of each frequency component of an incoming signal is modified by the filter.
Air filter
DEVICE COMPOSED OF FIBROUS MATERIALS WHICH REMOVES SOLID PARTICULATES FROM THE AIR
Filter (air); Air cleaner; Air filtration; Air filters; Universal air filter; Cabin air filter; Dust filter; Air Filters
A particulate air filter is a device composed of fibrous, or porous materials which removes solid particulates such as dust, pollen, mold, and bacteria from the air. Filters containing an adsorbent or catalyst such as charcoal (carbon) may also remove odors and gaseous pollutants such as volatile organic compounds or ozone.
air filter
DEVICE COMPOSED OF FIBROUS MATERIALS WHICH REMOVES SOLID PARTICULATES FROM THE AIR
Filter (air); Air cleaner; Air filtration; Air filters; Universal air filter; Cabin air filter; Dust filter; Air Filters
¦ noun a device for filtering particles from the air passing into an internal-combustion engine.
BED (file format)
TEXT FILE FORMAT FOR STORING GENOMIC REGIONS AS COORDINATES AND ASSOCIATED ANNOTATIONS
BED file format; .bed
The BED (Browser Extensible Data) format is a text file format used to store genomic regions as coordinates and associated annotations. The data are presented in the form of columns separated by spaces or tabs.
UV filter
![''[[Dipsastraea pallida]]'' (hard coral) with signs of bleaching or crown-of-thorns starfish damage](https://commons.wikimedia.org/wiki/Special:FilePath/Favia pallida (hard coral) with signs of bleaching or crown-of-thorns starfish damage.jpg?width=200 "''[[Dipsastraea pallida]]'' (hard coral) with signs of bleaching or crown-of-thorns starfish damage")
![Photolysis of [[benzophenone-3]] in presence of [[benzotriazole]]](https://commons.wikimedia.org/wiki/Special:FilePath/Photolysis of Benzophenone-3.svg?width=200 "Photolysis of [[benzophenone-3]] in presence of [[benzotriazole]]")
MATERIALS THAT BLOCK ULTRAVIOLET RADIATION
UV Filter; UV haze filter; UV filters; User:Gabdal1/sandbox2; Ultraviolet filter
UV filters are compounds, mixtures, or materials that block or absorb ultraviolet (UV) light. One of the major applications of UV filters is their use as sunscreens to protect skin from sunburn and other sun/UV related damage.
riverbed
![A woman digs in a dry stream bed in [[Kenya]] to find water during a drought.](https://commons.wikimedia.org/wiki/Special:FilePath/Digging for drinking water in a dry riverbed (6220146368).jpg?width=200 "A woman digs in a dry stream bed in [[Kenya]] to find water during a drought.")
CHANNEL BOTTOM OF A STREAM, RIVER, OR CREEK
Streambed; Bed of a stream; River bed; River beds; Bed (river); Channel bed; Creek bed; Riverbeds; Riverbed; River-bed
¦ noun the bed or channel in which a river flows.
Википедия
Sand filter
Sand filters are used as a step in the water treatment process of water purification.
There are three main types; rapid (gravity) sand filters, upward flow sand filters and slow sand filters. All three methods are used extensively in the water industry throughout the world. The first two require the use of flocculant chemicals to work effectively while slow sand filters can produce very high quality water with pathogens removal from 90% to >99% (depending on the strains), taste and odour without the need for chemical aids. Sand filters can, apart from being used in water treatment plants, be used for water purification in singular households as they use materials which are available for most people.
