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alameda ( ; ; spanish for "tree-lined path") is a city in alameda county, california, united states, located in the east bay region of the bay area. the city is primarily located on alameda island, but also spans bay farm island and coast guard island, as well as a few other smaller islands in san francisco bay. as of ... |
an alpha helix (or α-helix) is a sequence of amino acids in a protein that are twisted into a coil (a helix). the alpha helix is the most common structural arrangement in the secondary structure of proteins. it is also the most extreme type of local structure, and it is the local structure that is most easily predicted... |
accrington is a town in the hyndburn borough of lancashire, england. it lies about east of blackburn, west of burnley, east of preston, north of manchester and is situated on the culverted river hyndburn. commonly abbreviated by locals to "accy", the town has a population of 35,456 according to the 2011 census. accring... |
according to the book of revelation in the new testament of the christian bible, armageddon (; , late latin: , from hebrew: har məgīddō) is the prophesied location of a gathering of armies for a battle during the end times, which is variously interpreted as either a literal or a symbolic location. the term is also used... |
athlon is the brand name applied to a series of x86-compatible microprocessors designed and manufactured by amd. the original athlon (now called athlon classic) was the first seventh-generation x86 processor and the first desktop processor to reach speeds of one gigahertz (ghz). it made its debut as amd's high-end proc... |
amnon ( ’amnōn, "faithful") was, in the hebrew bible, the oldest son of king david and his second wife, ahinoam of jezreel. he was born in hebron during his father's reign in judah. he was the heir apparent to the throne of israel until he was assassinated by his half-brother absalom to avenge the rape of absalom's sis... |
the amu darya (also called the amu, amo river, and historically known by its latin name or greek ) is a major river in central asia and afghanistan. rising in the pamir mountains, north of the hindu kush, the amu darya is formed by the confluence of the vakhsh and panj rivers, in the tigrovaya balka nature reserve on t... |
the muslim conquests of afghanistan began during the muslim conquest of persia as the arab muslims migrated eastwards to khorasan, sistan and transoxiana. fifteen years after the battle of nahāvand in 642 ad, they controlled all sasanian domains except in afghanistan. fuller islamization was not achieved until the peri... |
the durrani empire (; ) or the afghan empire (; ), also known as the sadozai kingdom (; ), was an afghan empire that was founded by ahmad shah durrani in 1747, that spanned parts of central asia, the iranian plateau, and the indian subcontinent. at its peak, it ruled over the present-day afghanistan, much of pakistan, ... |
the aimaq () or chahar aimaq (), also transliterated as aymaq, aimagh, aimak and aymak, are a collection of sunni and mostly persian-speaking nomadic and semi-nomadic tribes. they live mostly in the central and western highlands of afghanistan, especially in ghor and badghis. aimaqs were originally known as chahar ("fo... |
|- bgcolor="#fffafa" | note (category: variability): || h and k emission vary. arcturus is the brightest star in the northern constellation of boötes. with an apparent visual magnitude of −0.05, it is the fourth-brightest star in the night sky, and the brightest in the northern celestial hemisphere. the name arcturus o... |
the androphagi were an ancient scythian tribe whose existence was recorded by ancient greco-roman authors. the androphagi were closely related to the melanchlaeni and the budini. name the name is a latinisation of the ancient greek name (), which meant "man-eaters." this name is a descriptive one based on this tribe's ... |
albert brooks (born albert lawrence einstein ; july 22, 1947) is an american actor, comedian, director and screenwriter. he received an academy award nomination for best supporting actor for 1987's broadcast news and was widely praised for his performance in the 2011 action drama film drive. brooks has also acted in ta... |
antares is the brightest star in the constellation of scorpius. it has the bayer designation α scorpii, which is latinised to alpha scorpii. often referred to as "the heart of the scorpion", antares is flanked by σ scorpii and τ scorpii near the center of the constellation. distinctly reddish when viewed with the naked... |
aldebaran () is a star located in the zodiac constellation of taurus. it has the bayer designation α tauri, which is latinized to alpha tauri and abbreviated alpha tau or α tau. aldebaran varies in brightness from an apparent visual magnitude 0.75 down to 0.95, making it the brightest star in the constellation, as well... |
altair is the brightest star in the constellation of aquila and the twelfth-brightest star in the night sky. it has the bayer designation alpha aquilae, which is latinised from α aquilae and abbreviated alpha aql or α aql. altair is an a-type main-sequence star with an apparent visual magnitude of 0.77 and is one of th... |
the australian broadcasting corporation (abc) is the national broadcaster of australia. it is principally funded by direct grants from the australian government and is administered by a government-appointed board. the abc is a publicly-owned body that is politically independent and fully accountable, with its charter e... |
alexandria ( ; ; ) is the second largest city in egypt, and the largest city on the mediterranean coast. founded in by alexander the great, alexandria grew rapidly and became a major centre of hellenic civilization, eventually replacing memphis, in present-day greater cairo, as egypt's capital. called the "bride of the... |
alexandria is a city in monroe township, madison county, indiana, united states. it is about northeast of indianapolis. according to the 2020 census, its population was 5,149, nearly unchanged from 2010. history alexandria was platted in 1836, when it was certain that the indiana central canal would be extended to that... |
alexandria is the ninth-largest city in the state of louisiana and is the parish seat of rapides parish, louisiana, united states. it lies on the south bank of the red river in almost the exact geographic center of the state. it is the principal city of the alexandria metropolitan area (population 153,922) which encomp... |
alexandria troas ("alexandria of the troad"; ; ) is the site of an ancient greek city situated on the aegean sea near the northern tip of turkey's western coast, the area known historically as troad, a little south of tenedos (modern bozcaada). it is located southeast of modern dalyan, a village in the ezine district o... |
alexandria (, ) is a town in west dunbartonshire, scotland. the town is on the river leven, north of dumbarton and north-west of glasgow. demographics in 2016, the estimated population of the town was 6,860. it is one of five towns in the vale of leven, the others being balloch, bonhill, jamestown and renton; their com... |
alexandria () is the capital city of the teleorman county, muntenia, romania. it is located south-west of bucharest, towards the bulgarian border, and has over 40,000 inhabitants. the 44th parallel north passes just north of the city. geography alexandria is situated in the middle of the wallachian plain, on the banks ... |
angela vincent (born 1942) is emeritus professor at the university of oxford and a fellow of somerville college, oxford. career and research angela vincent was born in 1942, the third child of carmen and joseph molony (later kcvo). after st mary's convent, ascot, she studied medicine at king's college london and westmi... |
in mathematics, the arithmetic–geometric mean of two positive real numbers and is the mutual limit of a sequence of arithmetic means and a sequence of geometric means: begin the sequences with x and y: then define the two interdependent sequences and as these two sequences converge to the same number, the arithmetic–ge... |
is a japanese manga artist and character designer. he first achieved mainstream recognition for his highly successful manga series dr. slump, before going on to create dragon ball (his best-known work) and acting as a character designer for several popular video games such as the dragon quest series, chrono trigger, an... |
epsilon ursae majoris is a star in the northern constellation of ursa major. the designation is latinised from ε ursae majoris and abbreviated epsilon uma or ε uma. it is officially named alioth . despite being designated "ε" (epsilon), it is the brightest star in the constellation and at magnitude 1.77 is the thirty-t... |
the amiga 500, also known as the a500, was the first popular version of the amiga home computer, "redefining the home computer market and making so-called luxury features such as multitasking and colour a standard long before microsoft or apple sold these to the masses". it contains the same motorola 68000 as the amiga... |
aga or aga may refer to: business architectural glass and aluminum (aga), a glazing contractor, established in 1970 aga (automobile), autogen gasaccumulator ag, 1920s german car company aga ab, aktiebolaget svenska gasaccumulator, a swedish company, the originator of the aga cooker aga rangemaster group, british manufa... |
the amiga 1000, also known as the a1000, is the first personal computer released by commodore international in the amiga line. it combines the 16/32-bit motorola 68000 cpu which was powerful by 1985 standards with one of the most advanced graphics and sound systems in its class. it runs a preemptive multitasking operat... |
in analytic geometry, an asymptote () of a curve is a line such that the distance between the curve and the line approaches zero as one or both of the x or y coordinates tends to infinity. in projective geometry and related contexts, an asymptote of a curve is a line which is tangent to the curve at a point at infinity... |
andrew stuart tanenbaum (born march 16, 1944), sometimes referred to by the handle ast, is an american-dutch computer scientist and professor emeritus of computer science at the vrije universiteit amsterdam in the netherlands. he is the author of minix, a free unix-like operating system for teaching purposes, and has w... |
ariane 5 was a retired european heavy-lift space launch vehicle developed and operated by arianespace for the european space agency (esa). it was launched from the centre spatial guyanais (csg) in french guiana. it was used to deliver payloads into geostationary transfer orbit (gto), low earth orbit (leo) or further in... |
arianespace sa is a french company founded in 1980 as the world's first commercial launch service provider. it undertakes the operation and marketing of the ariane programme. the company offers a number of different launch vehicles: the heavy-lift ariane 5 for dual launches to geostationary transfer orbit, the soyuz-2 ... |
in a computer's central processing unit (cpu), the accumulator is a register in which intermediate arithmetic logic unit results are stored. without a register like an accumulator, it would be necessary to write the result of each calculation (addition, multiplication, shift, etc.) to main memory, perhaps only to be re... |
abu zubaydah ( ; , abū zubaydah; born march 12, 1971, as zayn al-abidin muhammad husayn) is a palestinian citizen and alleged terrorist born in saudi arabia currently held by the u.s. in the guantanamo bay detention camp in cuba. he is held under the authority of authorization for use of military force against terroris... |
arithmetic () is an elementary part of mathematics that consists of the study of the properties of the traditional operations on numbers—addition, subtraction, multiplication, division, exponentiation, and extraction of roots. in the 19th century, italian mathematician giuseppe peano formalized arithmetic with his pean... |
andersonville is a city in sumter county, georgia, united states. as of the 2020 census, the city had a population of 237. it is located in the southwest part of the state, approximately southwest of macon on the central of georgia railroad. during the american civil war, it was the site of a prisoner-of-war camp, whic... |
andersonville may refer to: places united states andersonville, georgia, site of an american civil war prisoner of war camp andersonville prison, confederate prisoner of war camp in georgia holding union soldiers andersonville, chicago, a neighborhood in chicago, illinois andersonville commercial historic district, an ... |
the agra canal is an important indian irrigation work which starts from okhla in delhi. the agra canal originates at the okhla barrage, downstream of nizamuddin bridge. the canal receives its water from the yamuna river at okhla, about to the south of new delhi. the weir across the yamuna was constructed of locally qua... |
, which means "heaven's grass," is a series of islands off the west coast of kyushu, the southernmost of the four main islands of japan. geography the largest island of the amakusa group is shimoshima, which is 26.5 miles long and 13.5 miles at its widest (). it is situated at 32°20'n, 130°e, separated from the rest of... |
an afterglow in meteorology consists of several atmospheric optical phenomena, with a general definition as a broad arch of whitish or pinkish sunlight in the twilight sky, consisting of the bright segment and the purple light. purple light mainly occurs when the sun is 2–6° below the horizon, from civil to nautical tw... |
ammonius grammaticus (; ) was a 4th-century egyptian priest. in 391, he was involved in a violent revolt centred at alexandria's serapeum, where the pagan rebels tortured and killed captured christians. after the suppression of the revolt and the destruction of the temple, ammonius fled to constantinople, where he beca... |
in mathematics, particularly abstract algebra, an algebraic closure of a field k is an algebraic extension of k that is algebraically closed. it is one of many closures in mathematics. using zorn's lemma or the weaker ultrafilter lemma, it can be shown that every field has an algebraic closure, and that the algebraic c... |
advanced power management (apm) is a technical standard for power management developed by intel and microsoft and released in 1992 which enables an operating system running an ibm-compatible personal computer to work with the bios (part of the computer's firmware) to achieve power management. revision 1.2 was the last ... |
antoine-joseph "adolphe" sax (; 6 november 1814 – 7 february 1894) was a belgian inventor and musician who invented the saxophone in the early 1840s, patenting it in 1846. he also invented the saxotromba, saxhorn and saxtuba. he played the flute and clarinet. early life antoine-joseph sax was born on 6 november 1814 in... |
in phonetics, aspiration is the strong burst of breath that accompanies either the release or, in the case of preaspiration, the closure of some obstruents. in english, aspirated consonants are allophones in complementary distribution with their unaspirated counterparts, but in some other languages, notably most south ... |
an arteriovenous malformation (avm) is an abnormal connection between arteries and veins, bypassing the capillary system. usually congenital, this vascular anomaly is widely known because of its occurrence in the central nervous system (usually as a cerebral avm), but can appear anywhere in the body. the symptoms of av... |
atlanta ( , or ) is the capital and most populous city of the u.s. state of georgia. it is the seat of fulton county, although a portion of the city extends into neighboring dekalb county. with a population of 498,715 living within the city limits, atlanta is the eighth most populous city in the southeast and 38th most... |
axiology (from greek , axia: "value, worth"; and , -logia: "study of") is the philosophical study of value. it includes questions about the nature and classification of values and about what kinds of things have value. it is intimately connected with various other philosophical fields that crucially depend on the notio... |
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