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H2 (A
H2, H02, or H-2 may refer to: Arts and media * Armenia 2 (H2), a private television company broadcasting in Armenia and Nagorno-Karabakh * H2 (A&E Networks), the rebranded name of the former channel ''History International'' **H2 (American TV channel), the American version of the channel * H2 (manga), ''H2'' (manga), a baseball manga by Mitsuru Adachi * ''Halo 2'', a video game for the Xbox, created and developed by Bungie * Halloween II (2009 film), ''Halloween II'' (2009 film), initially abbreviated to ''H2'' * ''Hollywood Squares'', referred to as ''H2'' informally during the 2002–2004 seasons Computing * , level 2 heading markup for HTML Web pages, see HTML element#heading * H2 Database Engine, a DBMS written in Java * DSC-H2, a 2006 Sony Cyber-shot H series camera * HTTP/2, major revision of HTTP, often abbreviated in discussions as h2, and identifying itself to other servers as h2 in TLS negotiation or h2c in the HTTP Upgrade header * LGA 1155 CPU socket, also known as Socket ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Armenia 2
Second Armenian TV Channel Company (), also known as H2 () or Armenia 2, is a private television company broadcasting in Armenia and Republic of Artsakh, Artsakh. Approximately 95% of the TV viewers of Armenia and Artsakh are able to watch the channel, which broadcasts 18 hours daily. The company employs 250 people. The news block of the TV channel is called ''Lraber'' (, meaning "Herald") which has its own reporters throughout Armenia and Artsakh. The international overview is carried out based on the German Deutsche Welle TV channel. H2 TV also cooperates with the Russian channels ''Russia-1'' and ''NTV (Russia), NTV'' and other foreign channels. The president and the director of the TV channel is Samvel Mayrapetyan. The offices and the studios of the TV are located in the Ajapnyak district of Yerevan. History The frequencies that would later harbor Armenia 2 were first given to the state TV company under Soviet control. In 1973, the 40th edition of the Armenian SSR media p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Histamine H2 Receptor
H2 receptors are a type of histamine receptor found in many parts of the anatomy of humans and other animals. They are positively coupled to adenylate cyclase via Gs alpha subunit. It is a potent stimulant of cAMP production, which leads to activation of protein kinase A. PKA functions to phosphorylate certain proteins, affecting their activity. The drug betazole is an example of a histamine H2 receptor agonist. Function Histamine is a ubiquitous messenger molecule released from mast cells, enterochromaffin-like cells, and neurons. Its various actions are mediated by histamine receptors H1, H2, H3 and H4. The histamine receptor H2 belongs to the rhodopsin-like family of G protein-coupled receptors. It is an integral membrane protein and stimulates gastric acid secretion. It also regulates gastrointestinal motility and intestinal secretion and is thought to be involved in regulating cell growth and differentiation. Histamine may play a role in penile erection. Tissue distri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
H-2 MUPSOW
The H-2 SOW (Stand-Off Weapon) is a precision-guided glide bomb manufactured by NESCOM and deployed by the Pakistan Air Force, capable of striking targets at stand-off range. It has a terminal guidance system based on an infra-red imaging seeker which identifies the target during the final stage of flight. Designed to hit targets out to 60 km, the bomb may be able to evade radar. According to a Pakistani source, the H-2 is a lighter version of the H-4 SOW. The H-4 is reported by the Pakistani press to have been created by Pakistan's National Engineering and Scientific Commission (NESCOM), working in collaboration with the Pakistan Missile Organisation and Air Weapons Complex in Pakistan. Operational history The H-2 is stated to have entered service with the Pakistan Air Force in 2003. A television-guided version of the H-2 was launched at a mock target from a distance of 60 km by Mirage III/5 fighters of the Pakistan Air Force during a firepower demonstration on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
H-II Transfer Vehicle
The H-II Transfer Vehicle (HTV), also called , is an Expendable launch system, expendable Japanese Cargo spacecraft, automated cargo spacecraft designed for International Space Station (ISS) resupply missions, particularly the Kibo (ISS module), ''Kibō'' Japanese Experiment Module (JEM). Development of the spacecraft began in the early 1990s and the HTV's first mission, HTV-1, was launched on 10September 2009 on an H-IIB launch vehicle. The name ''Kounotori'' was chosen because "a white stork carries an image of conveying an important thing (a baby, happiness, and other joyful things), therefore, it precisely expresses the HTV's mission to transport essential materials to the ISS". The HTV is crucial for ISS resupply, especially after the retirement of the Space Shuttle, as it's the only vehicle capable of transporting large International Standard Payload Racks (ISPR) and disposing of old ones within the ISS's US Orbital Segment. The final HTV mission, Kounotori 9, was laun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
H-IIB
H-IIB (H2B) was an expendable space launch system jointly developed by the Japanese government's space agency JAXA and Mitsubishi Heavy Industries. It was used to launch the H-II Transfer Vehicle (HTV, or ''Kōnotori'') cargo spacecraft for the International Space Station. The H-IIB was a liquid-fueled rocket, with solid-fuel strap-on boosters and was launched from the Tanegashima Space Center in southern Japan. H-IIB made its first flight in 2009, and had made a total of nine flights through 2020 with no failures. H-IIB was able to carry a payload of up to to Geostationary transfer orbit (GTO), compared with the payload of 4000–6000 kg for the H-IIA, a predecessor design. Its performance to low Earth orbit (LEO) was sufficient for the H-II Transfer Vehicle (HTV). The first H-IIB was launched in September 2009 and the last H-IIB was launched in May 2020. Development The H-IIB was a space launch vehicle jointly designed, manufactured and operated by JAXA and Mi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
H-IIA
H-IIA (H-2A) is an active expendable launch system operated by Mitsubishi Heavy Industries (MHI) for the Japan Aerospace Exploration Agency. These liquid fuel rockets have been used to launch satellites into geostationary orbit; lunar orbiting spacecraft; '' Akatsuki'', which studied the planet Venus; and the Emirates Mars Mission, which was launched to Mars in July 2020. Launches occur at the Tanegashima Space Center. The H-IIA first flew in 2001. , H-IIA rockets were launched 49 times, including 43 consecutive missions without a failure, dating back to 29 November 2003. Production and management of the H-IIA shifted from JAXA to MHI on 1 April 2007. Flight 13, which launched the lunar orbiter SELENE, was the first H-IIA launched after this privatization. The H-IIA is a derivative of the earlier H-II rocket, substantially redesigned to improve reliability and minimize costs. There have been four variants, with two in active service (as of 2020) for various purposes. A d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
H-II
The H-II (H2) rocket was a Japanese satellite launch system, which flew seven times between 1994 and 1999, with five successes. It was developed by NASDA in order to give Japan a capability to launch larger satellites in the 1990s. It was the first two-stage liquid-fuelled rocket Japan made using only technologies developed domestically. It was superseded by the H-IIA rocket following reliability and cost issues. Background Prior to H-II, NASDA had to use components licensed by the United States in its rockets. In particular, crucial technologies of H-I and its predecessors were from the Delta rockets (the manufacturer of the Delta rockets, McDonnell Douglas, later Boeing and the United Launch Alliance, would later use the H-IIA's technologies (the rocket itself is the successor to the H-II) to create the Delta III, albeit short lived). Although the H-I did have some domestically produced components, such as LE-5 engine on the second stage and inertial guidance system, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
H Square
In mathematics and control theory, ''H''2, or ''H-square'' is a Hardy space with square norm. It is a subspace of ''L''2 space, and is thus a Hilbert space. In particular, it is a reproducing kernel Hilbert space. On the unit circle In general, elements of ''L''2 on the unit circle are given by :\sum_^\infty a_n e^ whereas elements of ''H''2 are given by :\sum_^\infty a_n e^. The projection from ''L''2 to ''H''2 (by setting ''a''''n'' = 0 when ''n'' < 0) is orthogonal. On the half-plane The given by : can be understood as a linear operator : where |
Hardy Space
In complex analysis, the Hardy spaces (or Hardy classes) H^p are spaces of holomorphic functions on the unit disk or upper half plane. They were introduced by Frigyes Riesz , who named them after G. H. Hardy, because of the paper . In real analysis Hardy spaces are spaces of distributions on the real -space \mathbb^n, defined (in the sense of distributions) as boundary values of the holomorphic functions. Hardy spaces are related to the ''Lp'' spaces. For 1 \leq p < \infty these Hardy spaces are s of spaces, while for |
H II Region
An H II region is a region of interstellar atomic hydrogen that is ionized. It is typically in a molecular cloud of partially ionized gas in which star formation has recently taken place, with a size ranging from one to hundreds of light years, and density from a few to about a million particles per cubic centimetre. The Orion Nebula, now known to be an H II region, was observed in 1610 by Nicolas-Claude Fabri de Peiresc by telescope, the first such object discovered. The regions may be of any shape because the distribution of the stars and gas inside them is irregular. The short-lived blue stars created in these regions emit copious amounts of ultraviolet light that ionize the surrounding gas. H II regions—sometimes several hundred light-years across—are often associated with giant molecular clouds. They often appear clumpy and filamentary, sometimes showing intricate shapes such as the Horsehead Nebula. H II regions may give birth to thousands of stars ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deuterium
Deuterium (hydrogen-2, symbol H or D, also known as heavy hydrogen) is one of two stable isotopes of hydrogen; the other is protium, or hydrogen-1, H. The deuterium nucleus (deuteron) contains one proton and one neutron, whereas the far more common H has no neutrons. The name ''deuterium'' comes from Greek '' deuteros'', meaning "second". American chemist Harold Urey discovered deuterium in 1931. Urey and others produced samples of heavy water in which the H had been highly concentrated. The discovery of deuterium won Urey a Nobel Prize in 1934. Nearly all deuterium found in nature was synthesized in the Big Bang 13.8 billion years ago, forming the primordial ratio of H to H (~26 deuterium nuclei per 10 hydrogen nuclei). Deuterium is subsequently produced by the slow stellar proton–proton chain, but rapidly destroyed by exothermic fusion reactions. The deuterium–deuterium reaction has the second-lowest energy threshold, and is the most astrophysically acce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrogen
Hydrogen is a chemical element; it has chemical symbol, symbol H and atomic number 1. It is the lightest and abundance of the chemical elements, most abundant chemical element in the universe, constituting about 75% of all baryon, normal matter. Under standard conditions, hydrogen is a gas of diatomic molecules with the chemical formula, formula , called dihydrogen, or sometimes hydrogen gas, molecular hydrogen, or simply hydrogen. Dihydrogen is colorless, odorless, non-toxic, and highly combustible. Stars, including the Sun, mainly consist of hydrogen in a plasma state, while on Earth, hydrogen is found as the gas (dihydrogen) and in molecular forms, such as in water and organic compounds. The most common isotope of hydrogen (H) consists of one proton, one electron, and no neutrons. Hydrogen gas was first produced artificially in the 17th century by the reaction of acids with metals. Henry Cavendish, in 1766–1781, identified hydrogen gas as a distinct substance and discovere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
