filtration is a physical, biological or chemical operation that separates solid matter and fluid from a mixture with a filter medium that has a complex structure through which only the fluid can pass. solid particles that cannot pass through the filter medium are described as oversize and the fluid that passes through is called the filtrate. oversize particles may form a filter cake on top of .
a nuclepore filter brand name nuclepore from whatman, part of ge healthcare is a kind of filter in which holes a few micrometres in size have been created in a plastic e.g. polycarbonate membrane.these filters are generally created by exposing the membrane to radiation that weakens the plastic and creates specific areas that can be removed by dousing the membrane in acid or other chemicals .
the role of the media in the perception of the vietnam war has been widely noted. intense levels of graphic news coverage correlated with dramatic shifts of public opinion regarding the conflict, and there is controversy over what effect journalism had on support or opposition to the war, as well as the decisions that policymakers made in response
an industrial filter press is a tool used in separation processes, specifically to separate solids and liquids.the process uses the principle of pressure drive, clarification needed as provided by a slurry pump.among other uses, filter presses are utilized in marble factories in order to separate water from mud in order to reuse the water during the marble cutting process.
depth filters are the variety of filters that use a porous filtration medium to retain particles throughout the medium, rather than just on the surface of the medium. these filters are commonly used when the fluid to be filtered contains a high load of particles because, relative to other types of filters, they can retain a large mass of particles before becoming clogged.
the belt filter sometimes called a belt press filter, or belt filter press is an industrial machine, used for solid/liquid separation processes, particularly the dewatering of sludges in the chemical industry, mining and water treatment. belt filter presses are also used in the production of apple juice, cider and winemaking.
a composite image filter is an electronic filter consisting of multiple image filter sections of two or more different types.. the image method of filter design determines the properties of filter sections by calculating the properties they have in an infinite chain of such sections.
merck is a supplier to the life science industry. the millipore corporation was founded in 1954, and listed among the s&p 500 since the early 1990s, as an international biosciences company, known widely for its micrometer pore-size filters and tests. in 2015, merck acquired sigma-aldrich and merged it with merck millipore. in the united states .
in mathematics, a filter is a special subset of a partially ordered set.filters appear in order and lattice theory, but can also be found in topology, from where they originate.the dual notion of a filter is an order ideal.. filters were introduced by henri cartan in 1937 and subsequently used by bourbaki in their book topologie générale as an alternative to the similar notion of a net .
a microphone, colloquially named mic or mike, is a device – a transducer – that converts sound into an electrical signal. microphones are used in many applications such as telephones, hearing aids, public address systems for concert halls and public events, motion picture production, live and recorded audio engineering, sound recording, two-way radios, megaphones, radio and television broadcasting, and in computers for recording voice, speech recognition, voip, and for non-acoustic .
in signal processing, a matched filter is obtained by correlating a known delayed signal, or template, with an unknown signal to detect the presence of the template in the unknown signal. this is equivalent to convolving the unknown signal with a conjugated time-reversed version of the template. the matched filter is the optimal linear filter for maximizing the signal-to-noise ratio snr in .
a french press, also known as a cafetière, cafetière à piston, caffettiera a stantuffo, press pot, coffee press, or coffee plunger, is a coffee brewing device. two french inventors mayer and delforge patented in 1852 a forerunner of the french press. a patent was filed by a frenchman, marcel-pierre paquet dit jolbert, officially published on august 5, 1924.
the merrill–crowe process is a separation technique for removing gold from the solution obtained by the cyanide leaching of gold ores. it is an improvement of the macarthur-forrest process, where an additional vacuum is managed to remove air in the solution invention of crowe , and zinc dust is used instead of zinc shavings improvement of merrill . .
the aeropress is a device for brewing coffee.it was invented in 2005 by aerobie president alan adler. coffee is steeped for 10–50 seconds depending on grind and preferred strength and then forced through a filter by pressing the plunger through the tube.
filters. by 1959, millipore made porous membrane filters of cellulose esters or other materials which resembled paper in sheet form, and were brittle when dry but friable when wet. filters consisted of nitrocellulose or polycarbonate membrane nucleopore filters ranging from pore size of 0.2 μm to 20 µm.
rotary vacuum drum filter. rotary vacuum drum filter rvdf , patented in 1872, is one of the oldest filters used in the industrial liquid-solids separation. it offers a wide range of industrial processing flow sheets and provides a flexible application of dewatering, washing and/or clarification.
adsorption is the adhesion of atoms, ions or molecules from a gas, liquid or dissolved solid to a surface. this process creates a film of the adsorbate on the surface of the adsorbent.this process differs from absorption, in which a fluid the absorbate is dissolved by or permeates a liquid or solid the absorbent , respectively. adsorption is a surface phenomenon, while absorption involves .
filters ownership. the size and profit-seeking imperative of dominant media corporations create a bias.the authors point to how in the early nineteenth century, a radical british press had emerged that addressed the concerns of workers, but excessive stamp duties, designed to restrict newspaper ownership to the 'respectable' wealthy, began to change the face of the press.
a microporous material is a material containing pores with diameters less than 2 nm. examples of microporous materials include zeolites and metal-organic frameworks.. porous materials are classified into several kinds by their size. the recommendations of a panel convened by the international union of pure and applied chemistry iupac are:. microporous materials have pore diameters of less .
a nanopore is a pore of nanometer size. it may, for example, be created by a pore-forming protein or as a hole in synthetic materials such as silicon or graphene. when a nanopore is present in an electrically insulating membrane, it can be used as a single-molecule detector.
microfiltration is a type of physical filtration process where a contaminated fluid is passed through a special pore-sized membrane to separate microorganisms and suspended particles from process liquid. it is commonly used in conjunction with various other separation processes such as ultrafiltration and reverse osmosis to provide a product stream which is free of undesired contaminants.
one of the main challenges to optimum biofilter operation is maintaining proper moisture throughout the system. the air is normally humidified before it enters the bed with a watering spray system, humidification chamber, bioscrubber, or biotrickling filter.