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AF BG Theorem
AF, af, Af, etc. may refer to: Arts and entertainment *A-F Records, Pittsburgh, Pennsylvania *''Almost Family'', US TV series Businesses and organizations European * ÅF, a Swedish technical consulting company * AF Gruppen, a construction company, Norway * Action Française, a French political movement * Air France, IATA code and stock symbol * Anarchist Federation (British Isles) International * Abercrombie & Fitch, A&F, US clothing shops * The Adaptation Fund, for climate change adaptation, UN * Adventist Forums, of Seventh-day Adventists Elsewhere * American Freightways, US trucking company, merged into FedEx Freight Language * Académie française, for French language matters * Alliance Française, promoting French language and culture * Acronym Finder, an online database * Afrikaans language (ISO 639-1 language code AF) * "...as fuck", meaning "very", in SMS language Medicine * Amniotic fluid * Atrial fibrillation, an abnormal heart rhythm Military * AF Guardian, a US Nav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
A-F Records
A-F Records was an American independent record label founded by punk rock band Anti-Flag – namely the band's drummer Pat Thetic, their rhythm guitarist Chris Head, and their lead vocalist Justin Sane – and based in Pittsburgh, Pennsylvania. It was created to help expose more political punk bands to a larger audience. History The band founded the label in 1997 so they could release their 1998 compilation album '' Their System Doesn't Work for You''. The compilation was the first official release under the label as well. Following the release of their own compilation, the band approached the Pittsburgh-based band Reagan Squad and the Boston-based band The Unseen, both of whom they believed to be "socially conscious," and the two bands released their own full-length LPs through A-F Records. The releases from Reagan Squad and The Unseen were the first non-Anti-Flag albums to be released by the label. Later, band then released ''East Coast Punk,'' a compilation featuring sever ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AF Guardian
The Grumman AF Guardian is the first purpose-built anti-submarine warfare (ASW) carrier-based aircraft to enter service with the United States Navy.Kowalski 1991, p. 3. It consisted of two airframe variants, one for detection gear, the other for weapons. The Guardian remained in service until August 1955, when it was replaced by the twin-engined Grumman S-2 Tracker. The Guardian was the largest single-engine piston-powered carrier aircraft ever to see service. Design and development The original design concept for the aircraft that would become the Guardian, the Grumman TB2F, XTB2F of 1944, was for a twin-engined aircraft with a warload and a range of .Kowalski 1991, pp. 2–3. This was considered to be too large for practical use from an , and was cancelled in 1945, replaced by a modified Grumman F7F Tigercat, the Grumman XTSF, XTSF-1. However, this too was considered impractical, and another alternative, the internally developed Grumman Model G-70, was selected instead, be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tropical Rainforest Climate
A tropical rainforest climate or equatorial climate is a tropical climate sub-type usually found within 10 to 15 degrees latitude of the equator. There are some other areas at higher latitudes, such as the coast of southeast Florida, United States, and Okinawa, Japan that fall into the tropical rainforest climate category. They experience high mean annual temperatures, small temperature ranges, and rain that falls throughout the year. Regions with this climate are typically designated ''Af'' by the Köppen climate classification. A tropical rainforest climate is typically hot, very humid, and wet with no dry season. Description Tropical rainforests have a type of tropical climate (with an average temperature of at least in their coldest month) in which there is no dry season—all months have an average precipitation value of at least . There are no distinct wet or dry seasons as rainfall is high throughout the months. One day in a tropical rainforest climate can be very simil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anisotropic Filtering
In 3D computer graphics, anisotropic filtering (AF) is a technique that improves the appearance of Texture filtering, textures, especially on surfaces viewed at sharp Viewing angle, angles. It helps make textures look sharper and more detailed by reducing blur and aliasing that can occur when surfaces are angled away from the viewer. Anisotropy, Anisotropic filtering works by applying different amounts of filtering in different directions, unlike simpler methods like Bilinear filtering, bilinear and trilinear filtering which filter equally in all directions. While it requires more processing power than these simpler methods, anisotropic filtering became a standard feature in most graphics cards in the late 1990s and is now commonly used in games and other 3D applications, often with user-adjustable settings. Comparison to isotropic algorithms Anisotropic filtering enhances texture sharpness, counteracting the blur introduced by mipmapping, a common Anti-aliasing filter, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Autofocus
An autofocus (AF) optical system uses a sensor, a control system and a motor to focus on an automatically or manually selected point or area. An electronic rangefinder has a display instead of the motor; the adjustment of the optical system has to be done manually until indication. Autofocus methods are distinguished as active, passive or hybrid types. Autofocus systems rely on one or more sensors to determine correct focus. Some AF systems rely on a single sensor, while others use an array of sensors. Most modern SLR cameras use through-the-lens optical sensors, with a separate sensor array providing light metering, although the latter can be programmed to prioritize its metering to the same area as one or more of the AF sensors. Through-the-lens optical autofocusing is usually speedier and more precise than manual focus with an ordinary viewfinder, although more precise manual focus can be achieved with special accessories such as focusing magnifiers. Autofocus accur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Attofarad
The farad (symbol: F) is the unit of electrical capacitance, the ability of a body to store an electrical charge, in the International System of Units (SI), equivalent to 1 coulomb per volt (C/V). It is named after the English physicist Michael Faraday (1791–1867). In SI base units 1 F = 1 kg−1⋅ m−2⋅ s4⋅ A2. Definition The capacitance of a capacitor is one farad when one coulomb of charge changes the potential between the plates by one volt. Equally, one farad can be described as the capacitance which stores a one-coulomb charge across a potential difference of one volt. The relationship between capacitance, charge, and potential difference is linear. For example, if the potential difference across a capacitor is halved, the quantity of charge stored by that capacitor will also be halved. For most applications, the farad is an impractically large unit of capacitance. Most electrical and electronic applications are covered by the following SI prefixes: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acre-feet
The acre-foot is a non- SI unit of volume equal to about commonly used in the United States in reference to large-scale water resources, such as reservoirs, aqueducts, canals, sewer flow capacity, irrigation water, and river flows. An acre-foot equals approximately an eight-lane swimming pool, long, wide and deep. Definitions As the name suggests, an acre-foot is defined as the volume of one acre of surface area to a depth of one foot. Since an acre is defined as a chain by a furlong (i.e. ), an acre-foot is . There have been two definitions of the acre-foot (differing by about 0.0006%), using either the international foot (0.3048 m) or a U.S. survey foot (exactly meters since 1893). On December 31, 2022, the National Institute of Standards and Technology, the National Geodetic Survey, and the United States Department of Commerce deprecated use of the US survey foot and recommended conversion to either the meter or the international foot. Application As a rule of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Audio Frequency
An audio frequency or audible frequency (AF) is a periodic vibration whose frequency is audible to the average human. The SI unit of frequency is the hertz (Hz). It is the property of sound that most determines pitch. The generally accepted standard hearing range for humans is 20 to 20,000 Hz (20 kHz). In air at atmospheric pressure, these represent sound waves with wavelengths of to . Frequencies below 20 Hz are generally felt rather than heard, assuming the amplitude of the vibration is great enough. Sound waves that have frequencies below 20 Hz are called infrasonic and those above 20 kHz are called ultrasonic. Sound propagates as mechanical vibration waves of pressure and displacement, in air or other substances. In general, frequency components of a sound determine its "color", its timbre. When speaking about the frequency (in singular) of a sound, it means the property that most determines its pitch. Higher pitches have higher frequency, and low ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alternative Frequency
Alternative frequency (or AF) is an option that allows a receiver to re-tune to a different frequency that provides the same station, when the first radio signal becomes too weak (e.g. when moving out of range). This is often used in car stereo systems, enabled by Radio Data System (RDS), or the U.S.-based Radio Broadcast Data System (RBDS Radio Data System (RDS) is a communications protocol standard for embedding small amounts of digital information in conventional FM radio broadcasts. RDS standardizes several types of information transmitted, including time, station identificat ...). References Radio technology {{Radio-comm-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Relay Channel
In information theory, a relay channel is a probability model of the communication between a sender and a receiver aided by one or more intermediate relay nodes. General discrete-time memoryless relay channel A discrete memoryless single-relay channel can be modelled as four finite sets, X_1, X_2, Y_1, and Y, and a conditional probability distribution p(y,y_1, x_1,x_2) on these sets. The probability distribution of the choice of symbols selected by the encoder and the relay encoder is represented by p(x_1,x_2). o------------------o , Relay Encoder , o------------------o Λ , , y1 x2 , , V o---------o x1 o------------------o y o---------o , Encoder , --->, p(y,y1, x1,x2) , --->, Decoder , o---------o o------------------o o---------o There exist three main relaying schemes: Decode-and-Forward, Compress-and-Forward and Amplify-a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agra Fort Railway Station
Agra Fort railway station, is located near Agra Fort, in Rawatpara, Agra. It used to be one of the stations in India that had both broad gauge and metre gauge, until the line to Jaipur was converted to broad gauge. Agra Fort railway station comes under the North Central Railways. Overview Agra, the 16-17th century capital of the Mughal Empire, Mughals, is home to monuments such as the Taj Mahal and Agra Fort. The Taj Mahal attracts 7–8 million tourists annually. About 0.8 million foreign tourists visit it. History The -wide metre-gauge Delhi–Bandikui and Bandikui–Agra lines of Rajputana State Railway were opened in 1874. The Agra–Jaipur line was converted to broad gauge in 2005. There was a spacious, octagonal Tripolia Chowk which existed between the Jama Masjid and the Delhi gate of the Agra Fort. This Tripolia was destroyed in order to create the Agra Fort railway station, which was also the first railway station of Agra and also one of the oldest in the country. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Afghanistan
Afghanistan, officially the Islamic Emirate of Afghanistan, is a landlocked country located at the crossroads of Central Asia and South Asia. It is bordered by Pakistan to the Durand Line, east and south, Iran to the Afghanistan–Iran border, west, Turkmenistan to the Afghanistan–Turkmenistan border, northwest, Uzbekistan to the Afghanistan–Uzbekistan border, north, Tajikistan to the Afghanistan–Tajikistan border, northeast, and China to the Afghanistan–China border, northeast and east. Occupying of land, the country is predominantly mountainous with plains Afghan Turkestan, in the north and Sistan Basin, the southwest, which are separated by the Hindu Kush mountain range. Kabul is the country's capital and largest city. Demographics of Afghanistan, Afghanistan's population is estimated to be between 36 and 50 million. Ancient history of Afghanistan, Human habitation in Afghanistan dates to the Middle Paleolithic era. Popularly referred to as the graveyard of empire ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
