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  1. A Bessel low-pass filter is characterized by its transfer function: = (/)where () is a reverse Bessel polynomial from which the filter gets its name and is a frequency chosen to give the desired cut-off frequency. The filter has a low-frequency group delay of /.Since () is indeterminate by the definition of reverse Bessel polynomials, but is a removable singularity, it is defined that () = ().

  2. The Butterworth filter is a type of signal processing filter designed to have a frequency response that is as flat as possible in the passband.It is also referred to as a maximally flat magnitude filter.It was first described in 1930 by the British engineer and physicist Stephen Butterworth in his paper entitled "On the Theory of Filter Amplifiers".

    • (, s, 2, +, 0.312869, s, +, 1, ), (, s, 2, +, 0.907981, s, +, 1, ), (, s, 2, +, 1.414214, s, +, 1, ), (, s, 2, +, 1.782013, s, +, 1, ), (, s, 2, +, 1.975377, s, +, 1, ), {\displaystyle (s^{2}+0.312869s+1)(s^{2}+0.907981s+1)(s^{2}+1.414214s+1)(s^{2}+1.782013s+1)(s^{2}+1.975377s+1)}
  3. The rotary vacuum drum filter is a continuous and automatic operation, so the operating cost is low. The variation of the drum speed rotating can be used to control the cake thickness. The process can be easily modified (pre-coating filter process). Can produce relatively clean product by adding a showering device.

  4. › wiki › Filter_dryerFilter dryer - Wikipedia

    Filter dryer. A filter drier is a piece of process equipment used during the filtration and drying phase of a pharmaceutical, bio pharmaceutical or chemical process for an active pharmaceutical ingredient (API) or other compounds production. Filter dryers are designed for washing and isolating solids with or without integrated containment systems.

  5. Rapid sand filter. The rapid sand filter or rapid gravity filter is a type of filter used in water purification and is commonly used in municipal drinking water facilities as part of a multiple-stage treatment system. [1] Rapid sand filters were first developed in the 1890s, and improved designs were developed by the 1920s. [2]

  6. Air-driven corner filter. Aquarium filters are critical components of both freshwater and marine aquaria. [1] [2] [3] Aquarium filters remove physical and soluble chemical waste products from aquaria, simplifying maintenance. Furthermore, aquarium filters are necessary to support life as aquaria are relatively small, closed volumes of water ...

  7. › wiki › Oil_filterOil filter - Wikipedia

    Oil filter. Spin-on oil filter, showing annular seal and screw-on thread. An oil filter is a filter designed to remove contaminants from engine oil, transmission oil, lubricating oil, or hydraulic oil. Their chief use is in internal-combustion engines for motor vehicles (both on- and off-road ), powered aircraft, railway locomotives, ships and ...

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