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145 (number)
145 (one hundred ndforty-five) is the natural number following 144 and preceding 146. In mathematics * Although composite, 145 is a Fermat pseudoprime to sixteen bases with b < 145. In four of those bases, it is a strong pseudoprime: 1, 12, 17, and 144. * Given 145, the Mertens function returns 0. * 145 is a and a centered square number. * . 145 is the fourth number that is the sum of two different pairs of < ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Natural Number
In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country"). Numbers used for counting are called ''cardinal numbers'', and numbers used for ordering are called ''ordinal numbers''. Natural numbers are sometimes used as labels, known as '' nominal numbers'', having none of the properties of numbers in a mathematical sense (e.g. sports jersey numbers). Some definitions, including the standard ISO 80000-2, begin the natural numbers with , corresponding to the non-negative integers , whereas others start with , corresponding to the positive integers Texts that exclude zero from the natural numbers sometimes refer to the natural numbers together with zero as the whole numbers, while in other writings, that term is used instead for the integers (including negative integers). The natural numbers form a set. Many other number sets are built by succ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ultramarathon
An ultramarathon, also called ultra distance or ultra running, is any footrace longer than the traditional marathon length of . Various distances are raced competitively, from the shortest common ultramarathon of to over . 50k and 100k are both World Athletics record distances, but some races are among the oldest and most prestigious events, especially in North America. Around 100 miles is typically the longest course distance raced in under 24 hours but there are also longer multi-day races of or more, sometimes raced in stages with breaks for sleep. While some ultras are road races, many take place on trails, leading to a large overlap with the sports of trail running and mountain running. Overview There are two main types of ultramarathon events: those that cover a specified distance or route, and those that last for a predetermined period of time (with the winner covering the most distance in that time). The most common distances are , , , and , although many races hav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
145 Adeona
Adeona ( minor planet designation: 145 Adeona) is a large asteroid from the intermediate asteroid belt, approximately in diameter. Its surface is very dark, and, based upon its classification as a C-type asteroid, is probably composed of primitive carbonaceous material. The spectra of the asteroid displays evidence of aqueous alteration. The Adeona family of asteroids is named after it. It was discovered by C. H. F. Peters on June 3, 1875, from the observatory at Hamilton College, Clinton, New York. Peters named it after Adeona, the Roman goddess of homecoming, because he had recently returned from a journey across the world to observe the transit of Venus. Peters also discovered 144 Vibilia on the same night. During 2001, ''Adeona'' was observed by radar from the Arecibo Observatory. The returned signal matched an effective diameter of 151 ± 18 km. This is consistent with the asteroid dimensions computed through other means. Two stellar occultations by ''Adeon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Common Era
Common Era (CE) and Before the Common Era (BCE) are year notations for the Gregorian calendar (and its predecessor, the Julian calendar), the world's most widely used calendar era. Common Era and Before the Common Era are alternatives to the original Anno Domini (AD) and Before Christ (BC) notations used for the same calendar era. The two notation systems are numerically equivalent: " CE" and "AD " each describe the current year; "400 BCE" and "400 BC" are the same year. The expression traces back to 1615, when it first appeared in a book by Johannes Kepler as the la, annus aerae nostrae vulgaris (), and to 1635 in English as " Vulgar Era". The term "Common Era" can be found in English as early as 1708, and became more widely used in the mid-19th century by Jewish religious scholars. Since the later 20th century, BCE and CE have become popular in academic and scientific publications because BCE and CE are religiously neutral terms. They are used by others who wish to be sen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Islamic Calendar
The Hijri calendar ( ar, ٱلتَّقْوِيم ٱلْهِجْرِيّ, translit=al-taqwīm al-hijrī), also known in English as the Muslim calendar and Islamic calendar, is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days. It is used to determine the proper days of Islamic holidays and rituals, such as the annual fasting and the annual season for the great pilgrimage. In almost all countries where the predominant religion is Islam, the civil calendar is the Gregorian calendar, with Syriac month-names used in the Levant and Mesopotamia (Iraq, Syria, Jordan, Lebanon and Palestine) but the religious calendar is the Hijri one. This calendar enumerates the Hijri era, whose epoch was established as the Islamic New Year in 622 CE. During that year, Muhammad and his followers migrated from Mecca to Medina and established the first Muslim community ('' ummah''), an event commemorated as the Hijrah. In the West, dates in this era are usually de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Embraer
Embraer S.A. () is a Brazilian multinational aerospace manufacturer that produces commercial, military, executive and agricultural aircraft, and provides aeronautical services. It was founded in 1969 in São José dos Campos, São Paulo, where its headquarters are located. The company is the third largest producer of civil aircraft, after Boeing and Airbus. History Seeking to develop a domestic aircraft industry, the Brazilian government under Getúlio Vargas' Estado Novo made several investments in the aerospace industry during the 1940s and 1950s. However, it was not until 1969, following the rise to power of a military junta in the 1964 Brazilian coup d'état, that Empresa Brasileira de Aeronáutica (Embraer) was created as a government-owned corporation.. Its first president, Ozires Silva, was a government appointee, and the company initially only produced a turboprop passenger aircraft, the Embraer EMB 110 Bandeirante. Early growth The Brazilian government contribute ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Regional Airliner
A regional airliner or a feederliner is a small airliner that is designed to fly up to 100 passengers on short-haul flights, usually feeding larger carriers' airline hubs from small markets. This class of airliners is typically flown by the regional airlines that are either contracted by or subsidiaries of the larger airlines. Regional airliners are used for short trips between smaller towns or from a larger city to a smaller city. Feederliner, commuter, and local service are all alternative terms for the same class of flight operations. History To keep short routes economical, airlines preferred using second hand aircraft than costlier new aircraft. Older aircraft were put into short haul service as they were replaced by new longer-range designs. Post-war era Propeller aircraft of larger airlines were transferred to smaller airlines: even the De Havilland Dragon Rapide biplane, or the Douglas DC-3s, in large surplus after the war, which the Aircraft manufacturers wante ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Embraer ERJ 145 Family
The Embraer ERJ family (for Embraer Regional Jet, model names EMB-135, EMB-140 and EMB-145) are regional jets designed and produced by the Brazilian aerospace company Embraer. The family includes the ERJ135 (37 passengers), ERJ140 (44 passengers), and ERJ145 (50 passengers), as well as the Legacy 600 business jet and the R-99 family of military aircraft. Development of the EMB145 was launched during 1989, its early design took the form of a turbofan-powered stretch of the existing turboprop-powered EMB 120 Brasilia feederliner. After the project was temporarily suspended in 1990, work on a revised configuration was undertaken during the early 1990s. While retaining the three-abreast seating of the Brasilia, the twinjet has a new swept wing and is powered by two rear-fuselage-mounted AE3007 turbofans for a range up to . By the time of its maiden flight on 11 August 1995, Embraer had garnered 18 firm orders, 16 options and 127 letters of intent for the type. On 10 December 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volvo 140 Series
The Volvo 140 Series is a line of mid-size cars manufactured and marketed by Volvo from 1966 to 1974 in two- and four-door sedan (models 142 and 144 respectively) as well as five door station wagon (model 145) body styles—with numerous intermediate facelifts. More than a million Volvo 140s were built. Introduction Volvo Cars began manufacturing the Volvo 144 at Torslandaverken in the late summer of 1966 for the 1967 model year. The 144 series, which followed the Volvo Amazon (120 series, outside of Sweden), was the first Volvo to use a tri-digit nomenclature, where the first digit indicated series, second digit indicated the number of cylinders, and third digit indicated the number of doors. Thus, a "144" was a 1st series, 4-cylinder, 4-door sedan. The 144 was the first Volvo to feature a more rectilinear or boxy styling. Compared to the Volvo Amazon, the 140 was a radical departure with minimal exterior and interior carryover, notably a stylised version of the front split gril ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Delahaye 145 Sports Car
''The'' () is a grammatical article in English, denoting persons or things already mentioned, under discussion, implied or otherwise presumed familiar to listeners, readers, or speakers. It is the definite article in English. ''The'' is the most frequently used word in the English language; studies and analyses of texts have found it to account for seven percent of all printed English-language words. It is derived from gendered articles in Old English which combined in Middle English and now has a single form used with pronouns of any gender. The word can be used with both singular and plural nouns, and with a noun that starts with any letter. This is different from many other languages, which have different forms of the definite article for different genders or numbers. Pronunciation In most dialects, "the" is pronounced as (with the voiced dental fricative followed by a schwa) when followed by a consonant sound, and as (homophone of pronoun ''thee'') when followed by a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helicopter
A helicopter is a type of rotorcraft in which lift and thrust are supplied by horizontally spinning rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward and laterally. These attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft and many forms of STOL (Short TakeOff and Landing) or STOVL (Short TakeOff and Vertical Landing) aircraft cannot perform without a runway. In 1942, the Sikorsky R-4 became the first helicopter to reach full-scale production.Munson 1968.Hirschberg, Michael J. and David K. Dailey"Sikorsky". ''US and Russian Helicopter Development in the 20th Century'', American Helicopter Society, International. 7 July 2000. Although most earlier designs used more than one main rotor, the configuration of a single main rotor accompanied by a vertical anti-torque tail rotor (i.e. unicopter, not to be confused with the single-blade monocopter) has become the most comm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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