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 band , American rock band Helium album Helium album , 2006 album by British group Urban Myth Club Helium.com , peer reviewed citizen journalism website The Late B.P. Helium , recording project and stage name of Bryan Poole disambig fr Helium homonymie ... more details
pp semi vandalism small yes About the chemical element Pp move indef Infobox helium Elementbox Helium ... element which he named helium. In 1903, large reserves of helium were found in the natural gas field s in parts of the United States, which is by far the largest supplier of the gas. Helium is used ... of superconducting magnet s, particularly the main commercial application 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 .... ref As with any gas with differing density from air, inhaling a small volume of helium temporarily ... fluid phases of helium 4, helium I and helium II, is important to researchers studying quantum ... near absolute zero have on matter such as superconductivity . Helium is the second lightest ... energy per nucleon of helium 4 with respect to the next three elements after helium lithium , beryllium , and boron . 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 greater than 0.5 solar masses. On Earth, the lightness of helium ... relatively rare 0.00052 by volume in the atmosphere. What helium is present today has been mostly ... particle s that are emitted by such decays consist of helium 4 atomic nucleus nuclei . This radiogenic helium is trapped with natural gas in concentrations up to 7 by volume, from which it is extracted ... Scientific discoveries The first evidence of helium was observed on August 18, 1868 as a bright ... decoration 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 ... 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 Heliair 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 ... 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 Type B stars star stub ... more details
Infobox Musical artist See Wikipedia WikiProject Musicians Name Helium Vola Img Img capt Img size Landscape Background group or band Origin Germany Instrument Voice type Genre Darkwave Occupation Years active 2001 present Label Associated acts URL 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 ... on Helium Vola are created. The projects main vocalist is Sabine Lutzenberger , though the project ... Lutzenberger, 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 ... euch die ihr 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 Vola Chrom Records 2001 , studio album some versions released with Omnis Mundi Creatura ... 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
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
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 helium download.html The Helium download page ref website http www.cs.uu.nl 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 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
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 arxiv 0707.2895 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 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 planets, not brown dwarfs, 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 09 30 07 Exoplanet Category Hypothetical planet types es Planeta de helio ru fi Heliumplaneetta ... more details
An antiprotonic helium atom is a three body object 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 in this reaction the antiproton first removes one of the two electrons contained in a normal helium atom How? , and then begins to orbit the helium nucleus in the electron s place. 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 many microseconds, before finally falling to its surface and annihilation annihilating . This remarkably long lifetime is seen only in the case of antiprotons mixed in helium in all other substances, antiprotons annihilate a million times faster, in less than a picosecond. Laser spectroscopy Antiprotonic helium is under study by the ASACUSA experiment at CERN . In these experiments, the atoms are first produced by stopping a beam of antiprotons in helium gas. The atoms are then irradiated by powerful laser beams, which cause the antiprotons in them to resonate and jump from one atomic orbit to another. By measuring the particular wavelength ... symmetry is broken. The most recent measurements using the antiprotonic helium atom show ... of 2 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 ... helium atoms Category Antimatter Category Atomic physics Category Exotic atoms it Elio antiprotonico ... 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 stable . 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 ... Helium 4 , is produced on Earth by alpha decay of heavier radioactive elements the alpha particle s that emerge are fully ionized SimpleNuclide Helium 4 nuclei. SimpleNuclide Helium 4 is an unusually ... 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 ... Helium 4 atoms are boson s while SimpleNuclide Helium 3 atoms are fermion s . ref cite book author .... There is only a trace amount of SimpleNuclide Helium 3 on Earth, primarily present since ... cite web author date title Helium Fundamentals url http www.mantleplumes.org HeliumFundamentals.html ... 13 ref In star s, however, SimpleNuclide Helium 3 is more abundant, a product of nuclear fusion . Extraplanetary ... Helium 3 from being bombarded by solar wind s. Exotic helium isotopes A subset of exotic light nucleus exotic light nuclei , the exotic helium isotopes have larger atomic masses than helium s natural isotopes. Although all exotic helium isotopes radioactive decay decay with a half life of less than ... collisions to create unusual atomic nucleus atomic nuclei for chemical element elements such as helium ... properties of neutron s. The shortest lived isotope is helium 5 with a half life of 7.6 ... more details
A helium flash is the runaway stellar nucleosynthesis fusion of triple alpha process helium in the core ... flashes. A helium flash occurs in these situations because the helium is degenerate matter degenerate ... 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 runs out of hydrogen , and the thermal ... 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 matter . When degeneracy ... the temperature reaches 100 million 200 million kelvin s and helium fusion begins using the triple ..., further raising the helium fusion rate and expanding the reaction region. However, the volume ... the degeneracy. The core can then expand and cool down and a stable burning of helium will continue ... title The core helium flash and surface abundance anomalies journal Astrophysical Journal year 1987 ... masses start to burn helium without their core becoming degenerate and so do not exhibit this type of helium flash. The helium flash is not directly observable on the surface by electromagnetic radiation ... helium flash by Deupree, R. G. ref but later star modeling taking neutrino energy loss into account ... Helium Flash by Deupree, R. G. ref ref http adsabs.harvard.edu abs 2009PhDT.........2M Multidimensional hydrodynamic simulations of the core helium flash in low mass stars by Moc k, M. ref Helium ... star, the hydrogen 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 ... giant phase. The star has burnt most of the helium available in the core, which is now composed of carbon and oxygen. Helium continues to burn in a thin shell around this core. The shell of helium ... 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 id arXiv astro ph 0405568 url accessdate quote Category Nuclear physics Category Nuclear fusion ko ja pt Processo de combust o do h lio zh ... more details
Image 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 ... ref Liquid helium 4 is used as a cryogenic refrigerant it is produced commercially for use in superconducting ... 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 below 0.9 K at the saturated vapor pressure . Below this temperature ... 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 of the dilution refrigerator , capable ... Wilks, p. 244. ref class wikitable Properties of liquid heliumHelium 4 Helium 3 Critical temperature ... book author Dieter Vollhart and Peter W lfle title The Superfluid Phases of Helium 3 page 3 publisher ... Liquid helium in a vacuum bottle at 4.2 K and 1 atm, boiling slowly. Image Liquid helium lambda point ..., hence no gas bubbles in the body of the liquid are formed. Image Liquid helium superfluid ... of Liquid and Solid Helium author J. Wilks year 1967 place Oxford publisher Clarendon Press isbn ..., etc. http boojum.hut.fi research theory he3.html Helium 3 phase diagram, etc. http hyperphysics.phy ... 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 Helium is the debut album by United Kingdom UK electronica group Urban Myth Club . Track listing e umc I. Sanderson M.Desvaux 0 47 I Feel It Sanderson Desvaux C. Szembek 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 Szembek 4 06 Bird s Eye View Sanderson Desvaux 3 58 So Beautiful Sanderson Desvaux R. 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
primarysources date September 2007 Infobox musical artist See Wikipedia WikiProject Musicians Name Helium Img Img capt Img size Background group or band Origin Boston , Massachusetts Genre indie rock , alternative rock alternative , noise pop Years active 1992 1997 Label Matador Records Associated acts Dumptruck, Autoclave band Autoclave URL Current members Mary Timony br Ash Bowie br Shawn Devlin Past members Mary Lou Lord br Brian Dunton Helium were an United States American alternative rock band formed in the summer of 1992. Originally calling themselves Chupa , its founding members were Mary Lou Lord , Mary Lou Lord is correct she was the original vocalist Jason Hatfield Juliana Hatfield Juliana s brother , Shawn King Devlin drums and Brian Dunton electric bass guitar . ref http bostonphoenix.com archive music 97 09 04 HELIUM.html Wonder Woman , Brett Milano, The Phoenix newspaper Boston Phoenix , September 4, 1997 ref Devlin and Dunton were both also in the band Dumptruck at the time. Mary Timony formerly of the band Autoclave band Autoclave soon replaced Mary Lou Lord on vocals ... to Helium . Timony became known for her Lolita term Lolita esque image e.g. short schoolgirl skirts and hairstyle and naughty lyrics, much like Helium s then labelmate Liz Phair . She was also ... City Helium album The Magic City . They toured the United States in early 1998 and disbanded shortly ... 1995 Matador Records The Magic City Helium album The Magic City 1997 Matador Records EP s class ... of Luck 1995 Superball E.P. Superball Tryan George The Dirt of Luck 1995 Honeycomb Helium song Honeycomb Brett Vapnek The Dirt of Luck 1997 Leon s Space Song The Magic City Helium album The Magic City References reflist External links http www.epitonic.com artists helium.html 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 rock groups Category Musical ... more details
Infobox Musical artist See Wikipedia WikiProject Musicians Name Mt. Helium Img Img capt Img size Landscape Background group or band Birth name Alias The Apex Theory Born Birth date and age YYYY MM DD Died Death date and age YYYY MM DD YYYY MM DD death date then birth Origin Los Angeles, California , United States USA Instrument Voice type Genre Alternative rock Occupation Years active 1999 present Label Dreamworks Records , TOYS.of.the.MASSES. Associated acts System of a Down , VoKee URL Current members Art Karamian br David Hakopyan br Sammy J. Watson Past members Ontronik Khachaturian Mt. Helium is an United States American alternative rock band from Los Angeles, California , formerly known as The Apex Theory . The band has released two 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 authorlink coauthors editor others title Nu metal url format accessdate edition series .... Helium, the band released their second album, Faces Mt. Helium album Faces as a digital download ... 15 December 2008 publisher Amazon.com ref Musical style Mt. Helium s style has been predominately ... guidelines Discography section Topsy Turvy album Topsy Turvy 2002 Faces Mt. Helium album Faces ... WikiProject Musicians Article guidelines Discography section References reflist Mt. Helium Category ... Theory es Mt. Helium fr Mt. Helium hr Mt. Helium it The Apex Theory pt Mt. Helium sv The Apex Theory ... more details
This article 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 ... 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 of Bohr ... to obtain the ground state energy levels of the helium atom along with the Hartree Fock method. Introduction The Hamiltonian of helium is given by math H psi vec r 1, , vec r 2 Bigg sum i 1,2 Bigg frac ... accurate and efficient methods used today to solve atomic systems. The many body problem for helium ... of helium is known to fifteen digits. In Hartree Fock theory, the electrons are assumed to move in a potential created by the nucleus and the other electrons. The Hamiltonian for helium with 2 electrons .... Therefor the wave function for helium can be written as math psi 0 0 vec r 1, vec r 2 psi 1 vec ... functions for the hydrogen Hamiltonian. For helium, Z 2 from math E 0 0 E 0 n 1 1, , n 2 1 Z 2 text ... 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, the screening effect of each electron on the other ... 2 2m nabla i 2 V vec r i Bigg int frac e 2 rho vec r vec r vec r d 3r math For helium, N 2, so the Hamiltonian ... accurate wave functions, the ground state energy of helium has been calculated closer and closer to the experimental ... and Zong Chao Van 1994 . Variational eigenvalues for the S states of helium , Chem. Phys. Lett. 229 ... of Fine Structure Splittings in Helium and He Like Ions , Phys. Rev. Lett. 74 , 4791 4794 ... helium , Phys. Scr. T83 , 83 92. http iopscience.iop.org 1402 4896 1999 T83 011 ref as well ... , High Precision Calculation of Helium Atom Energy Levels , in AIP ConferenceProceedings 189 , Relativistic ... Surfaces of Helium Atom Eigenfunctions , Physical Review Phys. Rev. A 75 060101, http scitation.aip.org ... 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 astronomy stub ... more details
Orphan date February 2009 Unreferenced date March 2009 Notability date 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 feet 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 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 ... York Oxford University Press 1998 page 24 ISBN 0 19 512708 0 ref The resulting Helium Privatization ... ref By 2007, the Federal government was reported as auctioning off the Amarillo Helium Plant. The National Helium Reserve itself was reported as, S lowly being drawn down and sold to private industry ... out of helium.html www.newscientist.com Article on Helium. coord missing Texas Category 1925 establishments Category Government of the United States Category Helium Category Potter County, Texas ... more details
Summary album cover fur REQUIRED Article Faces Mt. Helium album Use Infobox HIGHLY RECOMMENDED Source http www.amazon.com dp B001A660KW Amazon.com ADDITIONAL INFORMATION Name Faces Mt. Helium album Faces Artist Mt. Helium Label TOYS.of.the.MASSES. Graphic Artist Item Type Website Owner Commentary OVERRIDE FIELDS Description Portion Low resolution Yes. Purpose Replaceability other information Licensing Non free album cover ... more details
Orphan date September 2006 att March 2011 refimprove date April 2010 The helium dilution technique is the way of measuring the functional residual capacity of the lung s the volume left in the lung s after normal expiration . This technique is a closed circuit system where a spirometer is filled with a mixture of helium He and oxygen. The amount of He in the spirometer is known at the beginning of the test Concentration Volume Amount . The patient is then asked to breathe normal breaths in the mixture starting from FRC Functional Residual Capacity , which is the gas volume in the lung after a normal breath. The spirometer measures helium concentration. The helium spreads into the lungs of the patient,and settles at a new concentration C2 . Because there is no leak of substances in the system, the amount of helium remains constant during the test, and the FRC is calculated by using the following equation C1 V1 C2 V2 C1 V1 C2 V1 FRC FRC V1 C1 C2 C2 V2 Total gas volume FRC volume of spirometer . V1 Volume of gas in spirometer. C1 Initial known Helium Concentration. C2 Final Helium concentration Measured by the spirometer . Note To measure FRC we connect the patient to the spirometer directly after a normal breath when the lung volume equals FRC , if the patient is initially connected to the spirometer at a different lung volume like TLC or RV the measured volume will be the initial volume we started from and not FRC. In patients with obstructive pulmonary diseases the measurements of the helium dilution technique are not reliable because of incomplete equilibration of the helium ... helium dilution technique may be used as an alternative to quantitative CT scans to assess end ... title Lung volume in mechanically ventilated patients measurement by simplified helium dilution ... EELV He 208 0.858xEELV CT , r 0.941, p 0.001 between the two methods, and the helium dilution technique ... Helium Dilution Technique Category Breathing tests Category Pulmonology ... more details
A helium release valve , or helium escape valve , as it is also called, is a feature found on some diving watches . It provides functionality for Professional diving professional divers operating at great depths for prolonged periods of time or under Saturation diving saturation . When commercial divers operate at great depths, they often spend prolonged hours in Diving bell diving bells under pressure breathing a breathing gas mix like Trimix breathing gas trimix or similar, that contain the gases helium or hydrogen . Since helium atoms are the smallest natural gas particles found in nature, these gas atoms are able to work their way inside the watch, around any o rings or other seals the watch may feature. This is not a problem as long as the divers stay under pressure, but when the Decompression ... when they co created the helium escape valve in the 1960s first introduced in the Rolex Submariner ... reaches a critical level. Result The valve releases the helium, hydrogen and or other gases used in the breathing gas mix trapped inside the watch case. Automatic helium release valves usually don t need any manual operation. There are however helium release valves featuring an additional screw down ... to escape during decompression. Helium release valves can primarily be found on mechanical ... as more extreme dive watches. Models that feature a helium release valve include most of the Omega ... safe against the effects of helium gas without needing an additional opening in the case in form of a release valve.The most extreme mechanical diving watch equipped with a helium relief ... valve seadweller.jpg An integrated Helium release valve as used by Rolex for their latest version of the Rolex Sea Dweller , the Deepsea. Image He release valve seamaster.jpg A manually operated Helium ... Enzo HRV.jpg A manually operated Helium release valve as used by Enzo Mechana for their entire line ... equipment The UTS 2000M dive watch includes their own Automatic Helium Escape Valve HEV . http ... more details
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