wiktionary heliumHelium is chemical element. It may also refer to its isotopes Helium 3 , an isotope of heliumHelium 4 , an isotope of heliumHelium may refer to In science Helium dating , a method of determining the age of rocks Helium fusion , a type of nuclear fusion in stars Helium flash , the sudden beginning of helium fusion in certain kinds of stars Other Helium Haskell , programming language and compiler for learning Haskell Helium framework , a programming framework written in PHP Helium band , American rock band Helium album Helium album , 2006 album by British group Urban Myth Club Barsoom Red Martians Helium fictional city , fictional city state in Edgar Rice Burroughs Barsoom series of novels Helium.com , peer reviewed citizen journalism website The Late B.P. Helium , recording project and stage name of Bryan Poole disambig fr Helium homonymie it Elio disambigua pt H lio desambigua o ru ... more details
About the chemical element pp semi small yes Pp move indef Infobox helium Elementbox Helium IPAc en icon ... only as a gas except in extreme conditions. Helium is the second lightest element and is the second ... to the very high binding energy per nucleon of helium 4 with respect to the next three elements after helium. This helium 4 binding energy also accounts for its commonality as a product in both nuclear fusion and radioactive decay. Most helium in the universe is helium 4, and is believed to have been formed during the Big Bang . Some new helium is being created currently as a result of the nuclear fusion of hydrogen in stars. Helium is named for the Greek God of the Sun, Helios . It was first ... Swedish chemists, Per Teodor Cleve and Nils Abraham Langlet , who found helium emanating from the uranium ore cleveite . In 1903, large reserves of helium were found in natural gas field s in parts of the United States, which is by far the largest supplier of the gas today. Helium is used in cryogenics ... of superconducting magnet s, with the main commercial application being in MRI scanners. Helium s other ... Article.aspx?AID 35225 Helium Up, Up and Away? Melinda Rose, Photonics Spectra, Oct. 2008. Accessed Feb 27, 2010. For a more authoritative but older 1996 pie chart showing U.S. helium use by sector ... As with any gas with differing density from air, inhaling a small volume of helium temporarily changes ... phases of helium 4 helium I and helium II , is important to researchers studying quantum ... relatively rare 0.00052 by volume in the atmosphere. Most terrestrial helium present today is created ... particle s emitted by such decays consist of helium 4 atomic nucleus nuclei . This radiogenic helium ... The first evidence of helium was observed on August 18, 1868 as a bright yellow line with a wavelength ... balloons balloon helium gas Sir Norman Lockyer discovery of the element that he named helium Balloon Professional Magazine , 7 August 2009. ref ref cite web title Helium publisher Oxford ... more details
saved book title Helium subtitle An overview cover image Helium glow.jpg cover color Black Helium An overview Overview HeliumHelium atom Liquid helium Isotopes Isotopes of helium Diproton Helium 2 Helium 3 Helium 4 Miscellany Alpha particle Heliox Helium neon laser Helium hydride ion Hydreliox National Helium Reserve RasGas Rollin film Trimix breathing gas Trimix Category Wikipedia books on chemical elements Category Helium Wikipedia books on elements ... more details
A helium star or helium strong star is a stellar classification class O or B star blue , which has extraordinarily strong helium fraunhofer lines lines and weaker than normal hydrogen lines, indicating strong stellar winds and a mass loss of the outer envelope. Extreme helium star s EHe entirely lack hydrogen in their spectra. ref http www.daviddarling.info encyclopedia H helium star.html Daviddarling.info helium star ref Previously, a helium star was a synonym for a B class star, but this usage is considered obsolete. A helium star is also a term for a hypothetical star that could occur if two helium white dwarf s with a combined mass of at least 0.5 solar masses merge and subsequently start nuclear fusion of helium, with a lifetime of a few hundred million years. It is believed this is the origin of the extreme helium stars. References Reflist See also R Coronae Borealis variable Category Star types Category B type stars star stub it Stella all elio pt Estrela de h lio ... more details
Infobox musical artist See Wikipedia WikiProject Musicians name Helium Vola image caption image size background group or band origin Germany instrument genre Darkwave occupation years active 2001 present label associated acts website http www.helium vola.de www.helium vola.de current members Ernst Horn br Sabine Lutzenberger past members notable instruments Helium Vola is a Music of Germany German Darkwave or Electro Medieval band music band founded in 2001 by Ernst Horn , who was also one of the founding members of Qntal . In the contract with Chrom Records Horn insisted on Helium Vola not being seen as a successor of Qntal nor being marketed as such. The band s name is Latin language Latin meaning Fly, Helium a reference to the noble gas Helium which is used to fill balloons. ref http www.helium vola.de HELIUMVOLA discography f 2004b Liod bio liod d.html Etymology of the name on the band s official Homepage ref Helium Vola interpret medieval lyrics in Old High German , Middle High German ... Der Wald as well as pieces that are strongly based on samples e.g. Funerali and Iuvenes on Helium ..., vocals Discography All three albums published by Helium Vola are meant to be concept album s with a general theme. Helium Vola , with a mix of mostly medieval lyrics and news casts focuses on the shipwrecking ... liebt biography d.html title HELIUM VOLA, F r euch, die ihr liebt language German work Helium Vola publisher Ernst Horn, Chrom Records ref It contains a version of Die Moorsoldaten . Albums Helium ... Chrom Records 2004 EP music EP References reflist External links http www.helium vola.de Helium Vola Official website http www.laut.de wortlaut artists h helium vola Helium Vola at laut.de de icon MusicBrainz artist name Helium Vola id e0a1ff5e 3737 4569 b0e5 46079545fa20 http www.virtualnightangel.com helium page 001.html Pictures Category German musical groups Germany band stub de Helium Vola es Helium Vola fr Helium Vola nl Helium Vola pl Helium Vola ru Helium Vola ... more details
Infobox Software name Helium logo screenshot Image HintScreenshot.png 250px caption Hint interpreter developer Utrecht University latest release version 1.6 latest release date release date and age 2006 02 07 latest preview version 1.7 latest preview date Start date and age 2009 04 28 operating system Cross platform genre Compiler license GPL ref http www.cs.uu.nl wiki bin view Helium Downloads The Helium download page ref website http www.cs.uu.nl wiki HeliumHelium is a compiler and a dialect of the Functional programming functional programming language Haskell programming language Haskell . It has been designed to make learning Haskell easier by giving clearer error messages. It is being developed at Utrecht University , Netherlands , primarily by Arjan van IJzendoorn, Daan Leijen, Bastiaan Heeren and Rijk Jan van Haaften. Certain language features of Haskell have not been included to create more specific error messages. For this reason, it currently lacks type class es, rendering it incompatible with many Haskell programs. It also includes Hint, an interpreter written in Java programming language Java with a graphical user interface . References Bastiaan Heeren, Daan Leijen, Arjan van IJzendoorn, http www.cs.uu.nl bastiaan heeren helium.pdf Helium, for learning Haskell , Proceedings of the 2003 ACM SIGPLAN workshop on Haskell. references External links http www.cs.uu.nl wiki HeliumHelium website Simon Thompson, http www.cs.kent.ac.uk people staff sjt craft2e Haskell The Craft of Functional Programming, Second Edition , A textbook recommended on the Helium site for studying Haskell with Helium. Category Haskell programming language family Category Free Haskell implementations Category Free software programmed in Java Category Free compilers and interpreters Category Educational programming languages prog lang stub nl Helium Haskell ... more details
Helium dating may refer to the traditional uranium thorium dating or uranium thorium helium dating . ref http www.geo.arizona.edu reiners arhdl longer.htm U Th He dating, the University of Arizona Geochronology Lab ref A relatively new dating method, tritium helium dating has been developed for determining rates of oxygen utilization in the ocean. ref http www.sciencemag.org cgi content abstract sci 196 4287 291 W. J. Jenkins, Tritium Helium Dating in the Sargasso Sea A Measurement of Oxygen Utilization Rates , Science 15 April 1977 Vol. 196. no. 4287, pp. 291 292 ref References Reflist Category Radiometric dating Geochronology stub ... more details
refimprove date August 2010 A helium planet is a theoretical type of planet that may form via mass loss from a low mass white dwarf star. Ordinary gas giant planets such as Jupiter and Saturn consist primarily of hydrogen, with helium as a secondary component. But a helium planet might form in an environment where all the hydrogen has been processed to helium or other heavier elements by nuclear burning. Origin One scenario involves an AM CVn type of symbiotic binary star composed of two helium core white dwarf stars surrounded by a circumbinary helium accretion disk formed during mass transfer from the less massive to the more massive white dwarf. After it loses most of its mass, the less massive white dwarf may approach planetary mass. ref cite journal id journal ApJ title Mass Radius Relationships for Solid Exoplanets first S. last Seager coauthors M. Kuchner, C. Hier Majumder, B. Militzer year 2007 doi 10.1086 521346 volume 669 pages 1279 arxiv 0707.2895 bibcode 2007ApJ...669.1279S ref Characteristics Helium planets are predicted to be of roughly similar diameter to hydrogen helium planets of the same mass. But helium planets heavier than 13 Jupiter masses will still be planet s, not brown dwarf s, because they contain no deuterium and cannot fuse anything anymore. See also Helium Extrasolar planet Gas giant References reflist External links cite news url http www.astrobio.net pressrelease 2476 all planets possible publisher Astrobiology Magazine title All Planets Possible first last date 2007 09 30 Exoplanet Category Hypothetical planet types es Planeta de helio ja pl Planeta helowa pt Planeta de h lio ro Planet de heliu ru fi Heliumplaneetta uk ... more details
Antiprotonic helium is a three body atom composed of an antiproton and an electron orbiting around a helium Atomic nucleus nucleus . It is thus made partly of matter, and partly of antimatter. The atom is electrically neutral, since both electrons and antiprotons have a charge of 1, whereas helium nuclei have a charge of 2. The antiprotonic helium atom is called an atomcule, as it has a structure like an atom, but has two nuclei like a molecule. Production These exotic atoms can be produced by simply mixing antiprotons with ordinary helium gas the antiproton spontaneously removes one of the two electrons contained in a normal helium atom in a chemical reaction, and then begins to orbit the helium nucleus in the electron s place. This will happen in the case of approximately 3 of the antiprotons introduced to the helium gas. The antiproton s orbit, which has a large principal quantum number and angular momentum quantum number of around 38, lies far away from the surface of the helium nucleus. The antiproton can thus orbit the nucleus for tens of microseconds, before finally falling to its ... mixed in helium in all other substances, antiprotons annihilate a million times faster, in less than a picosecond. Laser spectroscopy Antiprotonic helium atoms are under study by the ASACUSA experiment ... in helium gas. The atoms are then irradiated by powerful laser beams, which cause the antiprotons in them ... of antiprotonic helium and the antiproton to electron mass ratio doi 10.1038 nature10260 ... of antiprotonic helium with separate high precision measurements of the antiproton s cyclotron frequency ... parts in a billion. Antiprotonic helium ions An antiprotonic helium ion is a two body object composed of a helium nucleus and orbiting antiproton. It has an electric charge of 1. Cold ions with lifetimes ... helium atoms http cdsweb.cern.ch record 966688 files PhysRevA.58.4406.pdf In uence of oxygen admixtures on the lifetime of metastable antiprotonic helium atoms Category Antimatter Category Atomic physics ... more details
A helium flash is the runaway stellar nucleosynthesis fusion of triple alpha process helium in the core ... layers of larger stars in shell flashes. A helium flash occurs in these situations because the helium ... where thermal pressure again becomes dominant, and the material then expands and cools. Core helium flash For a star with a mass less than 2.25 solar masses, the core helium flash occurs when the core ... to rise, a temperature val p 100 e 6 ul K is reached at which the helium can start to fuse, and so helium ignition occurs. The explosive nature of the helium flash arises from its taking place in degenerate ... dependent on temperature. Thus, once the temperature reaches 100 million 200 million kelvin s and helium ... of heat, the temperature rapidly increases, further raising the helium fusion rate and expanding the reaction ... down and a stable burning of helium will continue. ref Cite journal volume 317 pages 724 732 last Deupree first R. G. coauthors R. K. Wallace title The core helium flash and surface abundance anomalies ... with mass greater than about 2.25 solar masses starts to burn helium without its core becoming degenerate and so does not exhibit this type of helium flash. In a very low mass star less than about 0.5 solar mass , the core is never hot enough to ignite helium. The degenerate helium core will keep on contracting, and finally becomes a White dwarf Stars with very low mass helium white dwarf . The helium ......282..274D Two and three dimensional numerical simulations of the core helium flash by Deupree ... loss. ref http adsabs.harvard.edu abs 1996ApJ...471..377D A Reexamination of the Core Helium Flash ... simulations of the core helium flash in low mass stars by Moc k, M. ref Helium flash on binary white ... usually fuses to form helium. This helium can build up to form a shell near the surface of the star. When the mass of helium becomes sufficiently large, a helium flash can occur, with runaway fusion causing a nova . Shell helium flash Shell helium flashes are a similar helium ignition event, although ... more details
Infobox Software name Helium logo Image Helium framework Logo.png 50px author developer http www.phphelium.com contact Bryan Healey released latest release version 1.1 latest release date release date 2012 04 02 latest preview version latest preview date operating system Cross platform platform language Multilingual genre Web application framework license GNU General Public License website http www.phphelium.com phphelium.com Helium is an open source web application framework written in PHP which implements the Model view controller architectural pattern. It is designed to run either one or multiple websites and services through a monolithic core engine, and makes multilingual translations and mobile implementation easy to manage. History The Helium project started in October 2011. The first version of HeliumHelium 1.0 was developed under the GNU General Public License and the most recent stable release v1.1 is available on GitHub, SourceForge and Google Code, as well as on the project website. Architecture overview Helium is written in PHP 5.3 and is designed for MySQL LAMP integration. Flexibility every component of the core framework can be extended or replaced by application code. Modularity programming Modularity applications can be divided up into modules. Extensibility additional functionalities can be added to the framework by command line. Monolithic engine multiple websites and services can run atop the same core framework Intelligent page caching Allows individual subtemplates to be easily cached Features overview Automatic mobile implementation Simple language extensions Multi site single engine centralization A URL routing system. Simple and fast templating RESTful implementation. MVC implementation. Simple, scalable caching system External links http www.phphelium.com phphelium.com , official website http www.phphelium.com docs Helium Documentation https github.com phphelium Helium GitHub http sourceforge.net projects phphelium SourceForge http code.google.com ... more details
File Gas blending oxygen and helium analyser.JPG thumb 400px Analysing a trimix blend using a portable helium analyzer File Thermal conductivity analyser.png thumb 400px Principle of the thermal conductivity gas analyzer A Helium analyzer is an instrument used to identify the presence and concentration of helium in a mixture of gases. In Technical diving where breathing gas mixtures known as Trimix comprising oxygen , helium and nitrogen are used, it is necessary to know the fraction of helium in the mixture to reliably calculate Decompression diving decompression schedules for dives using that mixture. Thermal conductivity principle Portable instruments for the analysis of helium content of breathing gas mixtures may be based on a thermal conductivity sensor katharometer . These sensors can be very stable and maintenance free and also highly reliable and accurate. ref name Hitech http www.hitech inst.co.uk thermal conductivity sensors.php ref A typical thermal helium analyser comprises two chambers, each with an identical thermal conductivity sensor. One chamber is sealed and is filled with pure helium as the reference gas, and the other receives the sample gas. The difference in thermal conductivity of the reference and sample gases is measured and converted into a concentration value by the electronic circuitry in the instrument. The system is inherently stable and when precise temperature compensation is made, the system is more than adequately accurate for breathing gas analysis. Accuracy and display precicion is typically within 0.1 , and accuracy within 1 is considered sufficient for most decompression algorithms. ref name Hitech The thermal conductivity of nitrogen and oxygen are very similar, and that of helium very different so that the ratio of oxygen and nitrogen ... of helium fraction from these instruments. However for greater accuracy and compensation to oxygen ... helium and oxygen analysis of the mixture simultaneously. ref ANALOX 8000 Helium Analyse User Manual ... more details
Helium fusion is a kind of nuclear fusion , with the atomic nucleus nuclei involved being helium . The fusion of helium 4 nuclei alpha particle s is known as the triple alpha process , because fusion of just two helium nuclei only produces beryllium 8, which is unstable and breaks back down to two helium nuclei with a half life of 1× 10 sup 16 sup to 2.6× 10 sup 16 sup seconds. If the core temperature of a star exceeds 100 million kelvin s 100 megakelvins, 8.6 KeV , as may happen in the later phase of red giant s and red supergiant s, then a third helium nucleus has a significant chance of fusing with the beryllium 8 nucleus before it breaks down, thus forming carbon 12. Depending upon the temperature and density, an additional helium nucleus may fuse with carbon 12 to form oxygen 16, and at very high temperatures, additional fusions of helium to oxygen and heavier nuclei may occur see alpha process . The fusion of helium 3 with itself or with helium 4 occurs during the fusion of hydrogen in main sequence stars see proton proton chain , and is not ordinarily referred to as helium fusion. See also Fusion power References cite journal last Ray first Alak K. authorlink coauthors year 2004 month title Stars as thermonuclear reactors their fuels and ashes journal ar&Chi iv e print volume issue pages arxiv astro ph 0405568 url accessdate quote bibcode 2004astro.ph..5568R Category Nuclear physics Category Nuclear fusion ar ko ja pt Processo de combust o do h lio zh ... more details
Although there are eight known isotope s of helium He standard atomic mass 4.002602 2 unified atomic mass unit u , only helium 3 SimpleNuclide Helium 3 and helium 4 SimpleNuclide Helium 4 are stable isotope ... 22 sup seconds. In the Earth s atmosphere, there is one SimpleNuclide Helium 3 atom for every million SimpleNuclide Helium 4 atoms. ref name Nature s 178 cite book author J. Emsley year 2001 title Nature ... 19 850340 7 ref However, helium is unusual in that its isotopic abundance varies greatly depending on its origin. In the interstellar medium , the proportion of SimpleNuclide Helium 3 is around a hundred ... and Abundance of Interstellar Neutral Helium Based on Direct Measurements url http www.ingentaconnect.com ... name heliumfundamentals The different formation processes of the two stable isotopes of helium produce the differing isotope abundances. Equal mixtures of liquid SimpleNuclide Helium 3 and SimpleNuclide Helium 4 below 0.8 K will separate into two immiscible phases due to their dissimilarity they follow different quantum statistics SimpleNuclide Helium 4 atoms are boson s while SimpleNuclide Helium ... isotopes to achieve temperatures of a few millikelvins. Helium 2 diproton Helium 2, SimpleNuclide Helium 2 , also known as a diproton, is a hypothetical isotope of helium, which according to theoretical ... There may have been observations of unstable SimpleNuclide Helium 2 . In 2000, physicists first observed ... Helium 2 nucleus. ref http physicsworld.com cws article news 2762 Physicists discover new kind ... eject a diproton a pair of protons bound together as a SimpleNuclide Helium 2 nucleus which then decays ... processes was taking place. The best evidence of SimpleNuclide Helium 2 was found in 2008 at the Istituto ... productions of SimpleNuclide Helium 5 with collisions between a beam of SimpleNuclide Helium 6 nuclei and a cryogenic hydrogen target, it was discovered that the SimpleNuclide Helium 6 nucleus can donate ... be simultaneously ejected from the target as a SimpleNuclide Helium 2 nucleus, which quickly ... more details
File 2 Helium.png thumb Liquid helium in a cup. Helium exists in liquid form only at extremely low temperature ... of the helium see the table below for values. The density of liquid helium 4 at its boiling point ... ref http safety.seas.harvard.edu services helium.html Liquid Helium , accessed 2010 04 02 ref Helium ... Liquid helium 4 is used as a cryogenic refrigerant it is produced commercially for use in superconducting ... 38027 7 ref The temperatures required to liquefy helium are low because of the weakness of the attraction between helium atom s. The interatomic force s are weak in the first place because helium is a noble ... in helium because of its low atomic mass . The zero point energy of the liquid is less if the atoms ... weaker. ref name w1 Because of the weak interatomic forces, helium remains liquid down to absolute zero helium solidifies only under great pressure . At sufficiently low temperature, both helium 3 and helium 4 undergo a transition to a superfluid phase see table below . ref name w1 Liquid helium 3 and helium 4 are not completely miscible Citation needed date March 2012 below 0.9 K at the saturated ... into a lighter normal fluid that is mostly helium 3, and a denser superfluid that is mostly helium 4. This occurs because the system can lower its enthalpy by separating. At low temperatures, the helium 4 rich phase may contain up to 6 of helium 3 in solution, which makes possible the existence ... Properties of liquid heliumHelium 4 Helium 3 Critical temperature ref name w1 Wilks, p. 1. ref ... W lfle title The Superfluid Phases of Helium 3 page 3 publisher Taylor and Francis year 1990 ref gallery perrow 3 widths 210px heights 200px Image Liquid Helium.jpg Liquid helium in a vacuum bottle at 4.2 K and 1 atm, boiling slowly. Image Liquid helium lambda point transition.jpg Lambda point ... in the body of the liquid are formed. Image Liquid helium superfluid phase.jpg Superfluid phase ... oxygen colend References reflist 2 refbegin cite book title The Properties of Liquid and Solid Helium ... more details
their second album, The Magic City Helium album The Magic City . They toured the United States ... Title Year Label The Dirt of Luck 1995 Matador Records The Magic City Helium album The Magic City ... Helium song Honeycomb Brett Vapnek The Dirt of Luck 1997 Leon s Space Song The Magic City Helium ... Helium on epitonic http www.matadorrecords.com helium biography.html Matador bio http www.trouserpress.com entry.php?a helium Trouser Press entry Helium band DEFAULTSORT Helium Category American indie ... more details
Unreferenced date February 2007 Infobox Album See Wikipedia WikiProject Albums Name Helium Type studio Artist Urban Myth Club Cover Released 17th April 2006 Recorded Cambridge & Oxford, UK Genre Electronica Length 54 02 Label TRL Music Producer Ian Sanderson & Mark Desvaux Last album This album Helium br 2006 Next album Open Up br 2011 Helium is the best selling debut album by United Kingdom UK electronica duo Urban Myth Club . Track listing e umc I. Sanderson M.Desvaux 0 47 I Feel It Sanderson Desvaux 4 05 Calling Sanderson Desvaux 7 07 Schnorkle Sanderson Desvaux 3 27 Breathe Sanderson Desvaux 6 00 Spacewalk Sanderson Desvaux 6 45 Moon and the Night Sanderson Desvaux 4 06 Bird s Eye View Sanderson Desvaux 3 58 So Beautiful Sanderson Desvaux Godel 5 43 Atlantic Sanderson Desvaux 4 19 Sanctuary Sanderson Desvaux Godel 4 59 Secret Sanderson Desvaux 1 23 Cloud 9 Sanderson Desvaux 1 16 DEFAULTSORT Helium Album Category 2006 albums ... more details
Infobox musical artist See Wikipedia WikiProject Musicians name Mt. Helium image caption image size background group or band alias The Apex Theory origin Los Angeles, California , United States USA instrument genre Alternative rock occupation years active 1999 present label Dreamworks Records , TOYS.of.the.MASSES. associated acts System of a Down , VoKee website current members Art Karamian br David Hakopyan br Sammy J. Watson past members Ontronik Khachaturian Mt. Helium is an Armenia n United States American alternative rock band from Los Angeles, California , formerly known as The Apex Theory . The band has released three studio album s and three extended play s to date. History The Apex Theory was formed in 1999 by Armenia n American Los Angeles musicians Ontronik Khachaturian , Art Karamian and David Hakopyan. Drummer Sammy J. Watson joined the band after they were unable to find a committed drummer. ref name Wilson cite web url http allmusic.com cg amg.dll?p amg& 11 d9foxql0ldje T1 title Biography of The Apex Theory accessdate 15 December 2008 last Wilson first MacKenzie publisher Allmusic ref The band released their first extended play , Extendemo , in 2000. The following year, they signed with DreamWorks Records , ref name Iannini cite book last Iannini first Tommaso ... entitled inthatskyissomethingwatching. After changing their name to Mt. Helium, the band released their second album, Faces Mt. Helium album Faces as a digital download on June 3, 2008. ref cite web ... Amazon.com ref Musical style Mt. Helium s style has been predominately described as alternative rock ... 2002 small Discography Albums Random Bursts 2001 Topsy Turvy album Topsy Turvy 2002 Faces Mt. Helium ... 2007 References reflist Mt. Helium Category Alternative rock groups from California Category Armenian ... established in 1999 da Mt. Helium de The Apex Theory es Mt. Helium fr Mt. Helium hr Mt. Helium it The Apex Theory pt Mt. Helium ru Mt. Helium sv The Apex Theory ... more details
Chembox Verifiedfields changed verifiedrevid 458622974 SystematicName Helium ref Cite web url http pubchem.ncbi.nlm.nih.gov summary summary.cgi?cid 23987 title Helium PubChem Public Chemical Database work ... 231 168 5 UNNumber 1046 KEGG D04420 KEGG Ref keggcite changed kegg MeSHName Helium ChEBI Ref ebicite ... is about the physics of atomic helium. For other properties of helium, see helium . Helium is an Chemical element element and the next simplest atom to solve after the hydrogen atom . Helium is composed ..., depending on the Isotopes of helium isotope . The hydrogen atom is used extensively to aid in solving the helium atom . The Niels Bohr model of the atom gave a very accurate explanation of the hydrogen spectrum, but when it came to helium it collapsed. Werner Heisenberg developed a modification ... , is used to obtain the ground state energy levels of the helium atom along with the Hartree Fock method. Introduction The Hamiltonian quantum mechanics Hamiltonian of helium, considered as a three body ... atomic systems. The many body problem for helium and other few electron systems can be solved quite accurately. For example the ground state of helium is known to fifteen digits. In Hartree Fock .... The Hamiltonian for helium with 2 electrons can be written as a sum of the Hamiltonians for each ... two electrons cannot be in the same state. Therefor the wave function for helium can be written ... psi 1 math and math psi 2 math use the wave functions for the hydrogen Hamiltonian. For helium, Z ... value E sub 0 sub 2.903 a.u. of the ground state energy of helium. Since Z 2 in this case, the screening constant is S .30. For the ground state of helium, for the average shielding approximation ... r vec r d 3r math For helium, N 2, so the Hamiltonian is given by math H frac hbar 2 2m nabla 1 2 nabla ... of hydrogen. By using more complicated accurate wave functions, the ground state energy of helium ... of helium , Chem. Phys. Lett. 229 486 490. http www.sciencedirect.com science? ob ArticleURL& udi ... more details
Scanning helium microscope may refer to Scanning Helium Ion Microscope Atomic nanoscope , which was proposed and discussed in the literature, but is not yet competitive with optical microscope, electron microscope, Scanning Helium Ion Microscope and various scanning probe microscopes disambig ... more details
A Helium Focusing Cone is a concentration of Helium atoms that passed through the Sun s heliosphere and are concentrated in a conical region on the opposite side of where the particles entered. See also Solar wind External links http www.edpsciences.org articles aa abs 2004 42 aa0768 aa0768.html Observations of the helium focusing cone with pickup ions http sci.esa.int science e www object index.cfm?fobjectid 35853 The Flow of Interstellar Helium in the Solar System http science.nasa.gov headlines y2004 17dec heliumstream.htm A Breeze from the Stars , NASA Category Sun sun stub ... more details
Unreferenced date November 2011 Image Ballon orange.JPG thumb 250px An Aerophile SAS tethered helium balloon in Great Park, California. Image Montecasino helium balloon 001.jpg thumb 250px A tethered helium balloon on the ground, At Montecasino South Africa . A tethered helium balloon is a helium filled gas balloon which is tethered to the ground, or to a road vehicle, by a steel rope and raised and lowered by a winch. Tethered or static helium balloons The first tethered balloon in modern times was made in France at Chantilly Castle in 1994 by Aerophile SA and following the installation of a balloon in Paris in 1999 the company has installed more than 50 tethered balloons in 25 countries. A helium balloon is tethered at Montecasino in South Africa next to the Bird Gardens. The ride takes passengers up to approximately 120m above Fourways . Lindstrand Technologies has installed 30 tethered balloons in 18 countries. The Ahmedabad Eye is a tethered balloon installed at the Kankaria Kankaria Lakefront in Ahmedabad , India . The world s largest tethered helium balloon is located at Conner Prairie in Indiana. cn date March 2012 See also Balloon aircraft Moored balloon References Reflist External links commonscat Moored balloons Category Balloons aircraft ... more details
Multiple issues unreferenced March 2009 orphan February 2009 notability March 2009 Helium is a real time kernel for the HC S 08 processor core by Freescale and Atmel AVR . External links http helium.sourceforge.net Helium Website Category Operating system kernels computer stub ... more details
The National Helium Reserve , also known as the Federal Helium Reserve , is a strategic reserve of the United States holding over a billion cubic meters 1E9 m3 of helium gas. The helium is stored at the Cliffside Storage Facility about convert 12 mi km northwest of Amarillo, Texas , in a natural geologic gas storage formation, the Bush Dome reservoir. The reserve was established in 1925 as a strategic supply of gas for airship s, and in the 1950s became an important source of coolant during the Space Race and Cold War . The facilities were located to be close to the Hugoton Natural Gas Area Hugoton and other natural gas fields in southwest Kansas and the panhandles of Texas and Oklahoma. The natural gas in these fields contains unusually high percentages of helium, from 0.3 to 2.7 they constitute the largest source of helium in the United States. The helium is separated as a byproduct from the produced natural gas. After the Helium Acts Amendments of 1960 Public Law 86 777 , the United States Bureau of Mines U.S. Bureau of Mines arranged for five private plants to recover helium from natural gas. For this helium conservation program, the Bureau built a convert 425 mi km sing on pipeline from Bushton, Kansas , to connect those plants with the government s partially depleted Cliffside gas field. This helium nitrogen mixture was injected and stored in the Cliffside gas field until needed, when it then was further purified. By 1995, a billion cubic metres of the gas had been collected and the reserve was US 1.4 billion in debt, prompting the Congress of the United States in 1996 ... ref The resulting Helium Privatization Act of 1996 Public Law 104 273 directed the United States Department ... off the Amarillo Helium Plant. The National Helium Reserve itself was reported as, S lowly being ... nobel prizewinner we are running out of helium.html www.newscientist.com Article on Helium ... States Category Helium Category Buildings and structures in Potter County, Texas ... more details
Image Bp the lights 3.jpg 200px thumb right The Late B.P. Helium circa 2006 The Late B.P. Helium is the solo recording project and, at times, stage name of The Elephant Six Collective Elephant Six musician Bryan Poole , who also goes by Bryan Helium. Poole has spent much of his musical career playing guitar on and off with Of Montreal and Elf Power since the mid 90s. He was also a member of the XTC cover band Helium Kids a.k.a. The Mummers from 1994 to 1995. In 2001, he released a few singles and submitted tracks to various compilations before offering his first Extended play EP , Kumquat Mae , on his 2002 national tour. It was later re released on Orange Twin Records in 2003, and allowed him to work on his solo debut album, Amok The Late B.P. Helium album Amok , which was also released on Orange Twin in 2004. Poole is currently a full time member of Of Montreal. Image Kevin bp.jpg thumb B.P. and bandmate, Kevin Barnes on stage with Of Montreal in San Francisco, 2007. Discography Albums Amok The Late B.P. Helium album Amok CD Orange Twin 2004 Singles and EPs Happy Happy Birthday to Me Singles Club August 7 HHBTM 2001 Split single with Of Montreal 7 Jonathan Whiskey 2001 Kumquat Mae CD Hype City Records Orange Twin 2002 External links http www.thelatebphelium.com Official Late B.P. Helium Site Allmusic class artist id p558708 label The Late BP Helium of Montreal E6 DEFAULTSORT Late B.P. Helium, The Category The Elephant 6 Recording Company artists Category American indie rock groups Category Of Montreal US rock musician stub ... more details
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