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      Filtration is a physical process that separates solid matter and fluid from a mixture.
      Filter, filtering, filters or filtration may also refer to:


      Science and technology




      = Computing

      =
      Filter (higher-order function), in functional programming
      Filter (software), a computer program to process a data stream
      Filter (video), a software component that performs some operation on a multimedia stream
      Email filtering, the processing of email to organize it according to specified criteria
      Content-control software also known as an Internet filter
      Wordfilter, a script typically used on Internet forums or chat rooms
      Berkeley Packet Filter, filter expression used in the qualification of network data
      DSL filter, a low-pass filter installed between analog devices and a telephone line
      Helicon Filter, a raster graphics editor
      Filter (large eddy simulation), a mathematical operation intended to remove a range of small scales from the solution to the Navier-Stokes equations
      Kalman filter, an approximating algorithm in optimal control applications and problems
      Filter (social media), an appearance-altering digital image effect for social media


      = Device

      =
      Filter (chemistry), a device which separates solids from fluids (liquids or gases) by adding a medium through which only the fluid can pass
      Filter (aquarium), critical components of both freshwater and marine aquaria
      Filter paper, a semi-permeable paper barrier placed perpendicular to a liquid or air flow. It is used to separate fine solids from liquids or air
      Air filter, a device composed of fibrous materials which removes solid particulates such as dust, pollen, mold, and bacteria from the air
      Oil filter, a filter to remove contaminants from engine oil, transmission oil, lubricating oil, or hydraulic oil
      Pneumatic filter, a device which removes contaminants from a compressed air stream
      Water filter, removes impurities from water by means of a fine physical barrier, a chemical process or a biological process
      Cigarette filter, a part of a cigarette intended to filter the smoke inhaled by a smoker
      Coffee filter, a utensil used to separate coffee grounds from liquid coffee
      Fuel filter, found in most internal combustion engines
      Filtration (wine)
      Sieve or macroscopic filter, a device for separating wanted elements from unwanted material


      = Mathematics

      =
      Filter (mathematics), a special subset of a partially ordered set.
      Filter (set theory), a special family of subsets that forms an (order theoretic) filter with respect to set inclusion
      Filters in topology, the use of collections of subsets to describe convergence.
      Filtering problem (stochastic processes), a mathematical model for a number of filtering problems in signal processing and the like.
      Filtration (mathematics), an indexed set of subobjects of a given algebraic structure S.


      = Optics

      =
      Optical filter, selectively transmits light of different wavelengths
      Interference filter, reflects one or more spectral bands or lines and transmits others, while maintaining a nearly zero coefficient of absorption for all wavelengths of interest
      Dichroic filter, a very accurate color filter used to selectively pass light of a small range of colors while reflecting other colors
      Hydrogen-alpha filter, an optical filter that transmits a narrow bandwidth of light centred on the H-alpha wavelength
      Photographic filter, a camera accessory consisting of an optical filter that can be inserted in the optical path
      Infrared cut-off filter, designed to reflect or block mid-infrared wavelengths while passing visible light
      Chelsea filter, a dichromatic optical filter used for identifying coloured stones
      Astronomical filter, a telescope accessory used to enhance the details of celestial objects


      = Signal processing

      =
      Filter (signal processing)
      Electronic filter, an electronic circuit which processes signals, for example to remove unwanted frequency components
      Digital filter, a system that performs mathematical operations to reduce or enhance certain aspects of a signal
      Analogue filter, a basic building block of signal processing much used in electronics
      Filters used in digital image processing


      Arts and entertainment


      Filter (TV series), a show on the G4 channel
      Filter (magazine), an indie music magazine
      Filter Theatre, a British theatre company
      The Filter, a digital content services company based in England
      Filter (band), an American rock band
      "Filter", a song from the album Bend by 8stops7
      "Filter", a song from the album Map of the Soul: 7 by BTS
      "Filter", a song from the album Ruby by Jennie


      Other uses


      Biofilter, a pollution control technique using a bioreactor containing living material to capture and biologically degrade pollutants
      Filtering (housing), the process of housing units becoming more affordable with age
      Category-based filtering of perception, according to (objectivist interpretations of) Kant
      Affective filter, an impediment to learning or acquisition caused by negative emotional ("affective") responses to one's environment
      Lane splitting, a practice that cyclists use to pass slow or stopped congested traffic
      The ability of a person to self-censor themselves (their thoughts) whilst speaking


      See also


      Filter coffee, a method for preparing coffee
      Filter feeder, an animal that strains food particles from water
      Filtration camp (disambiguation)
      Lifter (signal processing)
      Philtre (disambiguation)
      Separation process
      Ultrafilter

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    Filter Icon PNGs for Free Download

    Filter Icon PNGs for Free Download

    FILTER - #5801686484 - Titan Machinery

    FILTER - #5801686484 - Titan Machinery

    Filter Announce New Album

    Filter Announce New Album 'The Algorithm': Hear "Obliteration"

    15 Hacks to Build Ultimate Filter UX/UI

    15 Hacks to Build Ultimate Filter UX/UI

    Multimedia filter - Filtering system - UNITECH

    Multimedia filter - Filtering system - UNITECH

    Rainwater Harvesting Filter System

    Rainwater Harvesting Filter System

    Cotton Filter FI20 - Megafresh Philipines | Water Filtration and Air ...

    Cotton Filter FI20 - Megafresh Philipines | Water Filtration and Air ...

    What is a filter?

    What is a filter?

    Best Sand for Pool Filter - HyClor

    Best Sand for Pool Filter - HyClor

    TikTok Teenage Filter: Image Gallery (Sorted by Score) (List View ...

    TikTok Teenage Filter: Image Gallery (Sorted by Score) (List View ...

    25 Easy Coffee Filter Crafts and Art Projects - Craftulate

    25 Easy Coffee Filter Crafts and Art Projects - Craftulate

    Aquarium Filter Waterfall Aeration Filter External External Filter ...

    Aquarium Filter Waterfall Aeration Filter External External Filter ...

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    powershell - How to effectively use the `-Filter` parameter on …

    The -Filter parameter can do more than just match on everything, which is effectively what -Filter * does. The -Filter string is very much like Powershell syntax (not quite, but most of the way there). You can use most of the same logical operators that Powershell supports, and they work much in the same way that Powershell operators do.

    python - List comprehension vs. lambda + filter - Stack Overflow

    The map and filter functions are still builtins in Python 3, but since the introduction of list comprehensions and generator ex‐ pressions, they are not as important. A listcomp or a genexp does the job of map and filter combined, but is more readable.

    Array.filter() in Angular 2 Component - Stack Overflow

    Nov 11, 2017 · In one component I can filter my array using the following: // Array of product objects const result = products.filter(p => p.name.includes('val')); and value of products remains same as the first value but filtered value stores in result. But in the following code, filter() filters array of strings itself:

    Excel FILTER() returning 0 for blank cells - Stack Overflow

    Nov 10, 2020 · FILTER() will often return a 0 for blank rows, even when a return string is specified. Using filter() I am often getting a 0 return value for empty cells. Assume these 6 rows of data in column A: abc xyz abc xyz abc If I use. FILTER(A10:A15, A10:A15 <> "xyz", "") I get back the following (sometimes): abc abc 0 abc

    Filter dataframe rows if value in column is in a set list of values

    Aug 22, 2012 · isin() is ideal if you have a list of exact matches, but if you have a list of partial matches or substrings to look for, you can filter using the str.contains method and regular expressions. For example, if we want to return a DataFrame where all of the stock IDs which begin with '600' and then are followed by any three digits:

    python - How to filter in NaN (pandas)? - Stack Overflow

    Jul 31, 2014 · Filter pandas data frame for NaN value without isnull. 1. Pandas Filter DF Column if Values are NaN or ...

    Pyspark: Filter dataframe based on multiple conditions

    I want to filter dataframe according to the following conditions firstly (d<5) and secondly (value of col2 not equal its counterpart in col4 if value in col1 equal its counterpart in col3). If the original dataframe DF is as follows:

    REST API filter operator best practice - Stack Overflow

    Setting the value of the filter query-string parameter to a string using those delimiters creates a list of name/value pairs which can be parsed easily on the server-side and utilized to enhance database queries as needed.

    c# - Setting the filter to an OpenFileDialog to allow the typical …

    Jan 15, 2010 · Use this method to return a Filter compatible string built from ImageCodecInfo supporting image formats the current system understands. /// <summary> /// Get the Filter string for all supported image types. /// To be used in the FileDialog class Filter Property.

    pyspark dataframe filter or include based on list

    Nov 4, 2016 · I am trying to filter a dataframe in pyspark using a list. I want to either filter based on the list or include only those records with a value in the list. My code below does not work: # define a