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PFR Rīga
PFR may refer to: Science and technology * Plug flow reactor model, a reactor simulation model * Prototype Fast Reactor, a nuclear reactor at Dounreay * PFR, Phosphate Flame Retardant, a type of Flame Retardant * pFR, a form of the light-sensing pigment phytochrome found in plants * pFR, polymeric Flame Retardant, a type of Flame Retardant * Polynomial Freiman-Ruzsa, a conjecture in Mathematics Other * PFR (band) (Pray for Rain), a Christian music group * Partito Fascista Repubblicano, a former political party in Italy * Pontefract Baghill railway station, England; National Rail station code PFR * PFFR, an alternative rock group * Portable Font Resource * Pork fried rice, a Chinese dish * Pro-Football-Reference.com Pro-Football-Reference.com is a website providing a variety of statistics for American football. It is one of the few sites that provides information on both active and retired players. The site provides statistics for teams dating back to 1920 ..., a website catalo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plug Flow Reactor Model
The plug flow reactor model (PFR, sometimes called continuous tubular reactor, CTR, or piston flow reactors) is a model used to describe chemical reactions in continuous, flowing systems of cylindrical geometry. The PFR model is used to predict the behavior of chemical reactors of such design, so that key reactor variables, such as the dimensions of the reactor, can be estimated. Fluid going through a PFR may be modeled as flowing through the reactor as a series of infinitely thin coherent "plugs", each with a uniform composition, traveling in the axial direction of the reactor, with each plug having a different composition from the ones before and after it. The key assumption is that as a plug flows through a PFR, the fluid is perfectly mixed in the radial direction but not in the axial direction (forwards or backwards). Each plug of differential volume is considered as a separate entity, effectively an infinitesimally small continuous stirred tank reactor, limiting to zero vo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prototype Fast Reactor
Dounreay (; gd, Dùnrath) is a small settlement and the site of two large nuclear establishments on the north coast of Caithness in the Highland area of Scotland. It is on the A836 road west of Thurso. The nuclear establishments were created in the 1950s. They were the Nuclear Power Development Establishment (NPDE) for the development of civil fast breeder reactors, and the Vulcan Naval Reactor Test Establishment (NRTE), a military submarine reactor testing facility. Both these no longer perform their original research functions and will be completely decommissioned, some of which has been in progress for a while. The two establishments have been a major element in the economy of Thurso and Caithness, but this will decrease with the progress of decommissioning. The NPDE will enter an interim care and surveillance state by 2036, and become a brownfield site by 2336. An announcement in July 2020 that the Nuclear Decommissioning Authority (NDA) will be taking over direct manag ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flame Retardant
The term flame retardants subsumes a diverse group of chemicals that are added to manufactured materials, such as plastics and textiles, and surface finishes and coatings. Flame retardants are activated by the presence of an ignition source and are intended to prevent or slow the further development of ignition by a variety of different physical and chemical methods. They may be added as a copolymer during the polymerisation process, or later added to the polymer at a moulding or extrusion process or (particularly for textiles) applied as a topical finish. Mineral flame retardants are typically additive while organohalogen and organophosphorus compounds can be either reactive or additive. Classes Both Reactive and Additive Flame retardants types, can be further separated into four distinct classes: * Minerals such as aluminium hydroxide (ATH), magnesium hydroxide (MDH), huntite and hydromagnesite, various hydrates, red phosphorus, and boron compounds, mostly borates. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phytochrome
Phytochromes are a class of photoreceptor in plants, bacteria and fungi used to detect light. They are sensitive to light in the red and far-red region of the visible spectrum and can be classed as either Type I, which are activated by far-red light, or Type II that are activated by red light. Recent advances have suggested that phytochromes also act as temperature sensors, as warmer temperatures enhance their de-activation. All of these factors contribute to the plant's ability to germinate. Phytochromes control many aspects of plant development. They regulate the germination of seeds (photoblasty), the synthesis of chlorophyll, the elongation of seedlings, the size, shape and number and movement of leaves and the timing of flowering in adult plants. Phytochromes are widely expressed across many tissues and developmental stages. Other plant photoreceptors include cryptochromes and phototropins, which respond to blue and ultraviolet-A light and UVR8, which is sensitive to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freiman's Theorem
In additive combinatorics, Freiman's theorem is a central result which indicates the approximate structure of sets whose sumset is small. It roughly states that if , A+A, /, A, is small, then A can be contained in a small generalized arithmetic progression. Statement If A is a finite subset of \mathbb with , A+A, \le K, A, , then A is contained in a generalized arithmetic progression of dimension at most d(K) and size at most f(K), A, , where d(K) and f(K) are constants depending only on K. Examples For a finite set A of integers, it is always true that :, A + A, \ge 2, A, -1, with equality precisely when A is an arithmetic progression. More generally, suppose A is a subset of a finite proper generalized arithmetic progression P of dimension d such that , P, \le C, A, for some real C \ge 1. Then , P+P, \le 2^d , P, , so that :, A+A, \le , P+P, \le 2^d , P, \le C2^d, A, . History of Freiman's theorem This result is due to Gregory Freiman (1964, 1966). Much interest in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PFR (band)
PFR is a Christian rock group from Minneapolis, Minnesota. Although the group initially disbanded in 1997, they periodically reunited from 2001 to 2013 and recorded two albums in that time. They reunited again in 2022 for two shows near Minneapolis with another show scheduled in Nashville in March 2023. Their name was originally "Pray for Rain", but was changed to "PFR" to avoid a conflict with another musical group. History PFR was founded in 1989 as the Joel Hanson Band by Joel Hanson, who was a camp counselor at Camp Shamineau, a Christian youth camp in Minnesota. In 1991, the band, then known as Inside Out, was signed to Brown Bannister's newly founded Vireo Records. After signing, Patrick Andrew suggested the band change the name to "Pray for Rain" after a line from a poem. In 1992, the band released ''Pray for Rain'', and gained some attention with the song "Do You Want to Know Love". Shortly after releasing the first album, an existing band (an instrumental group who ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Partito Fascista Repubblicano
The Republican Fascist Party ( it, Partito Fascista Repubblicano, PFR) was a political party in Italy led by Benito Mussolini during the German occupation of Central and Northern Italy and was the sole legal and ruling party of the Italian Social Republic. It was founded as the successor to the National Fascist Party while incorporating anti-monarchism, as they considered King Victor Emmanuel III to be a traitor after his signing of the surrender to the Allies. History After the Nazi-engineered Gran Sasso raid liberated Mussolini, the National Fascist Party (PNF) was revived on 13 September 1943 as the Republican Fascist Party (PFR) and as the single party of the Northern and Nazi-protected Italian Social Republic, informally known as the Salò Republic. Its secretary was Alessandro Pavolini. Due to the strong control of the Germans, the power of the party in the context of the Republic of Salò was always very limited. In order to obviate this inherent weakness, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pontefract Baghill Railway Station
Pontefract Baghill railway station is one of the three railway stations that serves the town of Pontefract, West Yorkshire, England. The other stations, Monkhill and Tanshelf, both lie on the Pontefract Line, while Baghill lies on the Dearne Valley Line south of York towards Sheffield. History The station was opened together with the Ferrybridge to Moorthorpe section of the Swinton and Knottingley Joint Railway. Public passenger train services began on 1 July 1879, freight traffic had already started by then. The design of the station followed basic principles of the North Eastern Railway, it was, however, larger than the other stations opened on the line at the same time. Pontefract Baghill was also once linked to the ''Wakefield, Pontefract & Goole'' main line by means of a short chord to near the intersection of the two lines as shown on the accompanying RCH map. This connection closed in November 1964, but the bay platform it once used at the northern end can stil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PFFR
PFFR is a Brooklyn-based production company and art collective consisting of Vernon Chatman, John Lee, Alyson Levy and formerly Jim Tozzi until 2009. The group has been active since 1998. Work The group's portfolio of work includes two albums, one 7-inch EP and one download-only EP (plus a string of live performances as a band), various art exhibits such as ''An Attack On All Americans or the Tyranny Of Weed'' shown at the LFL Gallery in New York and the script for the film ''Final Flesh''. In 2010, they held an exhibition/video screening of a selection of their work entitled ''PFFR Presents Legacy IIX'' which took place at the Synchronicity Space in Los Angeles, CA between April 3 and May 1. PFFR are also active in television comedy. They wrote, directed, produced and starred in the MTV2 variety show '' Wonder Showzen'' (2005–2006) and the Adult Swim CGI series '' Xavier: Renegade Angel''. For both these shows, Chatman and Lee are the directors and main voice talent, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Portable Font Resource
TrueDoc was an outline font standard developed by Bitstream that compactly encodes fonts for use in web pages through their TrueDoc system. Embedding a typeface in this way has the aim of eliminating graphics sometimes used in headings or other text, and replacing them by standard text, styled via CSS. The font files are made small by use of subsetting (only including the needed characters), and only need to be downloaded once. It is a secure method, in that fonts can only be used for the pages they were intended for, and not on other sites, or in other applications. TrueDoc was natively supported in Netscape Navigator 4, but was discontinued in Netscape Navigator 6 and Mozilla because Netscape could not release Bitstream's source code. A WebFont Player plugin was available for Internet Explorer, but the technology had to compete against Microsoft's Embedded Open Type fonts natively supported by Internet Explorer 4 and up (Windows versions only). Another impediment was the lack o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pork Fried Rice
Fried rice is a dish of cooked rice that has been stir frying, stir-fried in a wok or a frying pan and is usually mixed with other ingredients such as egg (food), eggs, vegetables, seafood, or meat. It is often eaten by itself or as an accompaniment to another dish. Fried rice is a popular component of East Asian cuisine, East Asian, Southeast Asian cuisine, Southeast Asian and certain South Asian cuisines, as well as a staple national dish of Indonesia. As a homemade dish, fried rice is typically made with ingredients Leftovers, left over from other dishes, leading to countless variations. Fried rice first developed during the Sui Dynasty in China and as such all fried rice dishes can trace their origins to Chinese fried rice. Many varieties of fried rice have their own specific list of ingredients. In Greater China, common varieties include Yangzhou fried rice and Hokkien fried rice. Japanese Chahan (dish), chāhan is considered a Japanese Chinese cuisine, Japanese Chinese dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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