File Closepacking box.svg thumb hcp and fcc closepacking of spheres In geometry , closepacking of equal sphere s is a dense arrangement of congruent spheres in an infinite, regular arrangement or Lattice ... of closepacking of spheres was first mathematically analyzed by Thomas Harriot around 1587 ... sphere and r sub 2 sub is the radius of the second. In closepacking all of the spheres share ... generation. To form an A B A B ... hexagonal closepacking of spheres, the coordinate points of the lattice .... Cardiff, Wales. PDF http alecjacobson.com graphics hw10b 3D Sphere Packing Applet ClosePacking of Spheres java applet DEFAULTSORT ClosePacking Of Spheres Category Discrete geometry Category Crystallography ... fraction of space occupied by spheres that can be achieved by a regular lattice arrangement is math frac pi 3 sqrt 2 simeq 0.74048. math The same packing density can also be achieved by alternate stackings of the same close packed planes of spheres, including structures that are aperiodic in the stacking ... Many crystal structures are based on a closepacking of atoms, or of large ions with smaller ions filling the spaces between them. The cubic and hexagonal arrangements are very close to one another ... an equally dense packing for spheres of a given radius. The most regular ones are fcc ABCABCA every third layer is the same hcp ABABABA every other layer is the same In closepacking, the center ... d is the diameter of a sphere this follows from the tetrahedral arrangement of close packed spheres ... Image Close packed spheres, with umbrella light & camerea.jpg 100000x250px Image Hexagonal close packed ... When forming any sphere packing lattice, the first fact to notice is that whenever two spheres touch ... A plane. ref MathWorld urlname HexagonalClosePacking title Hexagonal ClosePacking ref Miller indices ... by any arrangement of spheres, either regular or irregular. This conjecture is now widely considered .... They are called face centered cubic fcc also called cubic crystal system cubic close packed and Hexagonal ... more details
File Three SPHERES on International Space Station.jpg thumb right 400px SPHERES aboard ISS The Synchronized Position Hold, Engage, Reorient Experimental Satellites SPHERES experiment is a testbed consisting of three convert 8 in mm adj mid diameter miniaturized satellite s that can operate in a variety of environments, including inside the International Space Station ISS . The MIT Space Systems Laboratory developed the experiment to provide the United States Air Force Air Force and NASA with a long term, replenishable, and upgradable testbed for formation flight. It will be used to validate high risk control, metrology , and autonomy technologies. The technologies are critical to the operation of distributed satellite and docking missions such as TechSat21, Starlight , Terrestrial Planet Finder , and Orbital Express . The SPHERES concept was inspired by the List of Star Wars ranged weapons Training Remote Training Remotes from Star Wars . ref http science.nasa.gov headlines y2006 01jun spheres.htm?list79204 NASA Droids on the ISS ref Description To approximate the dynamics presented by these missions, the testbed consists of three miniaturized satellites , microsatellites or spheres, which can control their relative positions and orientations, and is operable on a 2 D laboratory platform, NASA s KC 135 , and the International Space Station . The testbed is being developed jointly ... NASA ref Timeline Three SPHERES vehicles were delivered to the International Space Station. The first ... research on the ISS References references External links Commons category SPHERES http ssl.mit.edu MIT Space Systems Lab http aurora.aero Aurora Flight Sciences http ssl.mit.edu spheres index.html SPHERES official website http science.nasa.gov headlines y2006 01jun spheres.htm NASA SPHERES website http www.theregister.co.uk 2010 04 20 iss spheres upgrades Space Station lightsabre sparring hoverdroids to be upgraded http science.nasa.gov science news science at nasa 2006 01jun spheres Droids ... more details
Wiktionary packing wikibooks Packing & Moving Household Goods Packing may refer to In Mechanical engineering Packing, also known as an O ring or other type of Seal mechanical , a term for a sealing material In Chemical engineering Structured packing , i.e. internals of a distillation column In Mathematics Sphere packing , a 3 dimensional mathematical problem Packing problem , a recreational mathematics approach Set packing , a classic computing problem. Packing may also refer to Backpacking Meat packing industry , the process of cutting up a slaughtered animal into saleable products. Packing firestopping , the process of installing backer materials, such as mineral wool in service penetrations Packing phallus , the practice of wearing a phallic object inside the clothing to give the appearance of male genitals Data compression , as in bit packing in computers Moving company , a business that puts goods into boxes to protect them and to make them easier to carry while in transit Tourism Concealed carry in the United States the practice of carrying a weapon for self protection An Autism therapies Packing autism therapy involving wrapping children in cold wet sheets. See also lookfrom intitle Pack disambiguation Packer disambiguation disambig ... more details
Hard spheres are widely used as model particles in the statistical mechanics statistical mechanical theory of fluids and solids. They are defined simply as impenetrable spheres that cannot overlap in space. They mimic the extremely strong repulsion that atoms and spherical molecules experience at very close distances. Hard spheres systems are studied by analytical means, by molecular dynamics simulations, and by the experimental study of certain colloid al model systems. Formal definition Hard spheres of diameter math sigma math are particles with the following pairwise interaction potential math V mathbf r 1, mathbf r 2 left begin matrix 0 & mbox if quad mathbf r 1 mathbf r 2 geq sigma infty & mbox if quad mathbf r 1 mathbf r 2 sigma end matrix right. math where math mathbf r 1 math and math mathbf r 2 math are the positions of the two particles. Hard spheres gas The first three virial coefficient s for hard spheres can be determined analytically math frac B 2 v 0 math math 4 frac math math frac B 3 v 0 2 math math 10 frac math math frac B 4 v 0 3 math math frac 712 35 frac 219 sqrt 2 35 pi frac 4131 35 pi arccos frac 1 sqrt 3 approx 18.365 math Higher order ones can be determined numerically using Monte Carlo integration . We list math frac B 5 v 0 4 math math 28.24 pm 0.08 math math frac B 6 v 0 5 math math 39.5 pm 0.4 math math frac B 7 v 0 6 math math 56.5 pm 1.6 math A table of virial coefficients for up to eight dimensions can be found on the page http www.sklogwiki.org SklogWiki index.php Hard sphere virial coefficients Hard sphere virial coefficients . Hard spheres liquid The static structure factor of the hard spheres liquid can be calculated using the Percus Yevick approximation . Literature J. P. Hansen and I. R. McDonald Theory of Simple Liquids Academic Press, London 1986 http www.sklogwiki.org SklogWiki index.php Hard sphere model Hard sphere model page on SklogWiki. Category Statistical mechanics Category Specific models nl Harde bollenmodel ... more details
Infobox Album See Wikipedia WikiProject Albums Name Hymns Spheres Type studio album Artist Keith Jarrett Cover Keith Jarrett Hymns Spheres.jpg Released 1979 Recorded at the Benedictine Abbey in Ottobeuren, Germany Genre Post bop Length 92 58 Label ECM record label ECM Producer Last album Eyes of the Heart br 1976 This album Hymns Spheres br 1976 Next album Sun Bear Concerts br 1976 Album ratings rev1 Allmusic rev1Score Rating 2 5 ref cite web url http www.allmusic.com album hymnsspheres r141472 title Hymns Spheres Keith Jarrett & 124 AllMusic first Richard S. last Ginell work allmusic.com year 2011 last update accessdate 18 July 2011 ref rev2 rev2Score Hymns Spheres is a jazz album by American pianist Keith Jarrett released in 1979 by the ECM record label ECM record label, recorded at the Benedictine Abbey in Ottobeuren, Germany. This solo album consists of improvisations on the massive Karl Joseph Riepp Trinity Baroque pipe organ. Track listing Hymn of Remembrance small Jarrett small 4 02 Spheres 1st Movement small Jarrett small 7 40 Spheres 2nd Movement small Jarrett small 12 59 Spheres 3rd Movement small Jarrett small 10 13 Spheres 4th Movement small Jarrett small 12 20 Spheres 5th Movement small Jarrett small 4 34 Spheres 6th Movement small Jarrett small 11 25 Spheres 7th Movement small Jarrett small 8 16 Spheres 8th Movement small Jarrett small 5 18 Spheres 9th Movement small Jarrett small 12 06 Hymn of Release small Jarrett small 4 05 Personnel Keith Jarrett pipe organ References Refbegin Reflist Refend DEFAULTSORT Hymns Spheres Category Keith Jarrett albums Category 1976 albums Category Post bop albums Category ECM Records albums ... more details
Infobox Single See Wikipedia WikiProject Songs Name Spheres Cover Mike Oldfield Spheres.jpg Cover size Border Caption Artist Mike Oldfield Album Music of the Spheres Mike Oldfield album Music of the Spheres A side B side Released start date 2008 3 3 df y Format Digital download Recorded Genre classical music Classical br New age music New Age Length 5 22 Label Universal Music Classics and Jazz br Mercury Records Writer Mike Oldfield Producer Mike Oldfield Audio sample? Certification Last single Surfing song Surfing br 2005 This single Spheres br 2008 Next single Misc Spheres is a classical music classical music download digital only single by Mike Oldfield from his album Music of the Spheres Mike Oldfield album Music of the Spheres released on 3 March 2008 see 2008 in music . Demo version The track Spheres is an early demo from the conception of Music of the Spheres and thus has no input from others, such as Karl Jenkins . It contains parts of the tracks Harbinger and Shabda from the album. The track is largely recorded using synthesized instruments, which were not used in the final album in favour of a full orchestra. Charts At the week ending 9 March 2008, Spheres was 1 on the 7digital Track Chart. ref cite web url http www.7digital.com charts track title Track Chart publisher 7 Digital date 2008 03 09 accessdate 2008 03 10 ref Track listing Spheres 5 22 References Reflist Mike Oldfield Category 2008 singles Category Mike Oldfield songs Category Songs written by Mike Oldfield cs Spheres Mike Oldfield pl Spheres ... more details
DnDmodule module title Crystal Spheres module image Image SJA3 Crystal Spheres.jpg 250px alt The hummingbird swoops past a darkened sun. image caption The cover of the Crystal Spheres module, with art by Brom . The artwork depicts the Hummingbird, swooping past a darkened sun. module code SJA3 module rules Advanced Dungeons & Dragons Editions of Dungeons & Dragons Advanced Dungeons & Dragons 2nd edition 2nd edition module character levels 5 7 module campaign Spelljammer module authors J. Paul LaFountain module first published 1990 series about the AD&D game module the cosmological model Celestial spheres Crystal Spheres is an Adventure Dungeons & Dragons adventure module published in 1990 for the Dungeons & Dragons Advanced Dungeons & Dragons fantasy role playing game . Plot summary Crystal Spheres is a Spelljammer scenario, where the player characters encounter a unique ship, called the Hummingbird and its captain asks them to help save his homesphere from a mysterious bard called T Lann . ref name SW http spelljammer.wikia.com wiki SJA3 Crystal Spheres SJA3 Crystal Spheres article at Spelljammer Wiki ref Publication history SJA3 Crystal Spheres was written by J. Paul LaFountain , with a cover by Gerald Brom Brom , and was published by TSR in 1990 as a 64 page booklet with a poster and an outer folder. ref name SW http spelljammer.wikia.com wiki SJA3 Crystal Spheres SJA3 Crystal Spheres article at Spelljammer Wiki ref Reception Empty section date February 2011 Reviews Empty section date February 2011 References reflist Category Dungeons & Dragons modules Category Spelljammer D&D stub ... more details
Infobox Album Name Remixes of the Spheres Type remix Artist Ian Brown Cover Ian Brown ROTS.jpg Released 26 November 2002 Recorded 2001 2002 Genre Alternative rock , Indie rock Length 61 44 Label Universal Records Universal Producer James Lavelle Last album Music of the Spheres Ian Brown album Music of the Spheres br 2001 This album Remixes of the Spheres br 2002 Next album Solarized br 2004 Album ratings rev1 Allmusic rev1Score Rating 2 5 ref Allmusic class album id r618584 pure url yes ref Remixes of the Spheres is a collection of mixes, live versions and unreleased B sides by former lead singer of the Stone Roses , Ian Brown . The album reworks many tracks from his 3rd album, Music of the Spheres Ian Brown album Music of the Spheres . UNKLE , Nightmares on Wax and Freelance Hellraiser were among the collaborators on this album. Track listing F.E.A.R. Unkle UNKLE Mix 5 55 Northern Lights The Freelance Hellraiser Mix 5 42 The Gravy Train Nightmares On Wax N.O.W. Mix 5 00 Forever and a Day Cedarblue Mix 4 12 Shadow of a Saint The Boy Bierton Mix 6 26 Superstar 4 50 My Star 2002 4 05 Hear No See No Speak No Album Version 5 25 Cokane in My Brain DJ Mek Nuremberg Scratch Mix 1 45 The Gravy Train N.O.W. Instrumental 5 07 Stardust Instrumental 4 38 El Mundo Pequeno Live Acoustic Version 2 48 F.E.A.R UNKLE Instrumental 5 51 References reflist Ian Brown Category Ian Brown albums Category 2002 remix albums Category Universal Records remix albums ... more details
italic title Infobox album See Wikipedia WikiProject Albums Name Metallic Spheres Type Album Artist The Orb featuring David Gilmour Cover Released Start date 2010 10 12 df y Recorded 2009 Genre Ambient br Progressive Rock Length 48 53 Label Columbia Records Columbia Producer Alex Paterson Chronology The Orb albums Last album Baghdad Batteries Orbsessions Volume III 2009 This album Metallic Spheres br 2010 Next album Misc Extra chronology Artist David Gilmour albums Type album Last album Live in Gda sk br 2008 This album Metallic Spheres br 2010 Next album Album reviews rev1 Allmusic rev1score Rating 3 5 ref Allmusic class album id metallic spheres r1959984 pure url yes Allmusic review ref rev2 The A.V. Club rev2score C ref http www.avclub.com articles the orb featuring david gilmour metallic spheres,46253 The A.V. Club review ref rev3 Pitchfork Media rev3score 7.0 10 ref http pitchfork.com reviews albums 14692 metallic spheres Pitchfork Media review ref rev4 QoQuaq Music rev4score 4 5 ref http qoquaq.blogspot.com 2010 10 metallic spheres.html QoQuaq Music review ref rev5 SPIN magazine SPIN rev5score Rating 5 10 ref http www.spin.com reviews orb vs david gilmour metallic spheres columbiasony SPIN review ref Automatically generated by DASHBot Metallic Spheres is the tenth studio album ... spheres to be celebrated through original laser show and appearances by the orb 103943418.html title The Orb Featuring David Gilmour s Metallic Spheres to be Celebrated Through Original Laser ... author Columbia Records ref Track listing Metallic Side 28 42 Metallic Spheres Hymns to the Sun Black Graham Hiding in Plain View Classified Spheres Side 20 12 Es Vedra Hymns to the Sun Reprise Olympic ..., and mixing by Youth. References reflist The Orb David Gilmour DEFAULTSORT Metallic Spheres Category The Orb albums Category 2010 albums 2010s album stub cs Metallic Spheres ka Metallic Spheres nl Metallic Spheres nn Metallic Spheres pl Metallic Spheres ru Metallic Spheres ... more details
Spheres of exchange is a classic topic in anthropology , ref name Sillitoe 1 Sillitoe, Paul 2006 Why spheres of exchange? Ethnology 45 1 pp. 1 23, page 1 ref and a heuristic tool for analyzing trading restrictions within societies that are communally governed and where resources are communally available. ref name Sillitoe 1 Basically, taboos or restrictions on the trading or gifting of subsistence items for wealth items can be analyzed using a spheres of exchange template where the production and utilization of wealth is considered as a different category or sphere from subsistence activities and products. These societal restrictions exist in order to maintain the availability of subsistence for all of the group s members by preventing their accumulation by a few, and these restrictions also inhibit the accumulation of wealth by a few individuals, to the detriment of the community. ref Bohannan, Paul and Dalton, George 1965 Introduction pages 3 7 In Bohannan, Paul and Dalton, George editors 1965 Markets in Africa Eight subsistence economies in transition Doubleday, Garden City, New Jersey, pp. 1 26, http www.worldcat.org oclc 64841839 OCLC 64841839 ref The introduction of money into communal societies where these sphere of exchange restrictions exist can disrupt resource allocation ... Sillitoe 2 Sillitoe, Paul 2006 Why spheres of exchange? Ethnology 45 1 pp. 1 23, page 2 ref However, in some societies money has been more or less successfully integrated into spheres of exchange. ref Barth, Fredrik 1967 Economic Spheres in Darfur pages 156 157 and 164 165 In Firth, Raymond editor ... 3121 5 9 20Economic 20spheres 20in 20Darfur.pdf Chapter 9 Economic Spheres in Darfur pages 163 164 ... name Sillitoe 3 Sillitoe, Paul 2006 Why spheres of exchange? Ethnology 45 1 pp. 1 23, page 3 ref of spheres ... In calling these different areas of exchange spheres, we imply that each includes commodities that are not regarded as equivalent to those commodities in other spheres and hence in ordinary situations ... more details
player with up to 8 players. External links http www.spheresofchaos.com Official Spheres of Chaos Web Site http www.spheresofchaos.com p tips.php Spheres of Chaos quick tips. http www.acornarcade.com articles Spheres of Chaos bonus list index980.html Spheres of Chaos Powerups. Category 2000 video ... more details
Infobox short story See Wikipedia WikiProject Novels name The Crystal Spheres title orig translator author David Brin country language English series genre Science Fiction published in publication type publisher media type pub date 1984 english pub date preceded by followed by The Crystal Spheres is a science fiction short story by David Brin , originally published in the January 1984 issue of Analog magazine Analog and collected in The River of Time . ref http www.isfdb.org cgi bin title.cgi?48767 ISFDB entry ref It won the Hugo Award for Best Short Story 1985. ref http www.locusmag.com SFAwards Db NomLit17.html 619 Locus Index to SF Awards ref In it, Brin presents an explanation for the Fermi Paradox . Plot summary Humanity s first attempt at interstellar space travel ends in disaster as the ship is destroyed near the edge of the Solar System by a transparent barrier. They come to realize that Earth and every other Earth like solar system are surrounded by crystal spheres , while uninhabitable systems are not. Every attempt to break spheres around other systems from the outside fails. Mankind is thus prevented from expanding and colonizing the universe. The main character takes part in an expedition to a newly discovered habitable solar system with a shattered sphere. They discover the remnants of an alien civilization, the Nataral. From studying the Nataral, they learn that the only way to break the crystal spheres is from the inside. It appears as if the spheres have been put in place by someone something to prevent any single civilization from dominating the universe. It is also discovered that the Nataral chose to go into a kind of suspended animation around a black hole while waiting for the other civilizations of the universe to develop interstellar flight capabilities. Authors notes In the author notes for this story, Brin outlines both sides of the Fermi paradox ... links isfdb title id 48767 title The Crystal Spheres DEFAULTSORT Crystal Spheres, The Category Science ... more details
Two ways to stack three planes made of spheres Dense packing main Closepacking of spheres In three dimensional Euclidean space, the densest packing of equal spheres is achieved by a family of structures called Closepacking of spheresclose packed structures. One method for generating such a structure ... of a random closepacking of spheres which is stable against compression. ref cite journal title ... unequal spheres, n dimensional Euclidean space where the problem becomes circle packing in two dimensions ... . A typical sphere packing problem is to find an arrangement in which the spheres fill as large a proportion ... Image closepacking box.svg thumb right 160px HCP lattice left and the FCC lattice right are two ... cubic closepacking or face centred cubic where the layers are alternated in the ABCABC sequence. The other is called hexagonal closepacking where the layers are alternated in the ABAB sequence. But many ... isbn 0 226 28247 3 pages 82 90 ref Irregular packing main Random close pack If we attempt to build a densely ... or 2 dimensional spheres i.e. line segments or disks will yield a regular packing. Hypersphere ... of close packed equal spheres, or combining the multiple sizes of spheres into a chemical compound compound or interstitial compound interstitial packing. When many sizes of spheres or a particle ... the first, it is possible to arrange the large spheres in a close packed arrangement, and then arrange ... 1.1698327 ref File Binary sphere packing LS3.png thumb A dense packing of spheres with a radius .... Structures are known which exceed the closepacking density for radius ratios up to 0.659786. ref ... packing becomes much more difficult. In a hyperbolic space there is no limit to the number of spheres ... 2791 7 ref Other spaces Sphere packing on the corners of a hypercube with the spheres defined by Hamming ... The Packing of Spheres url journal Scientific American volume 250 issue pages 116 125 bibcode 1984SciAm.250 ... java applet http www.randomwalk.de sphere insphr spheresinsphr.html Densest Packing of spheres into a sphere ... more details
graphical perspective in the painting and the spheres he had painted. ref name Liquid Dal ... galatea spheres.htm Galatea of Spheres Salvador Dal DEFAULTSORT Galatea Of The Spheres ... more details
225px right thumb Geocentric celestial spheres Peter Apian s Cosmographia Antwerp, 1539 Image ... orbs The celestial spheres , or celestial orbs , were the fundamental entities of the cosmological ... spheres made of an aetherial transparent fifth element quintessence , like jewels set in orbs. In the geocentric model adopted in the Middle Ages, the planetary spheres i.e. those that contained planets ... the spheres of the Moon , Mercury planet Mercury , Venus , Sun , Mars , Jupiter , and Saturn . In more detailed models the seven planetary spheres contained other secondary spheres within them. The planetary spheres were followed by the stellar sphere containing the fixed stars other scholars ... the standard model for the upper spheres. ref Bruce S. Eastwood, Ordering the Heavens Roman Astronomy ... about the relative place of the spheres of Mercury and Venus Ptolemy placed both of them beneath ... spheres were actually thick spheres of rarefied matter nested one within the other, each one ... by Copernicus, the ascending order of the planets and their spheres going outwards from the Sun ... antiquity the ideas of celestial spheres and rings first appeared in the cosmology of Anaximander ... a planetary model using concentric spheres for all the planets, with three spheres each for his ... 27 spheres in all ref Neugebauer, History of Ancient Mathematical Astronomy, vol. 2, pp. 677 85. ref ... five spheres for his models of the Sun, Moon, Mercury, Venus, and Mars and retaining four spheres for the models of Jupiter and Saturn, thus making 33 spheres in all. ref name Lloyd p. 173 ref Neugebauer ... to the innermost of its own particular set of spheres. Although historians of Greek science have traditionally ... cosmology of spheres, based on the mathematical models of Eudoxus. In Aristotle s fully developed celestial ... 47 or 55 interconnected spheres which form a unified planetary system, ref Aristotle, Metaphysics ... 2001 ref whereas in the models of Eudoxus and Callippus each planet s individual set of spheres were ... more details
Infobox Album See Wikipedia WikiProject Albums Name Spheres 2 Type studio Artist Delerium Cover Released 1994 Recorded Genre Electronica Electronic Length Label Producer Bill Leeb, Rhys Fulber Reviews Allmusic rating 3 5 Allmusic class album id r266192 pure url yes link Last album This album Next album Spheres 2 is an album by Canadian industrial electronic music group Delerium in 1994 see 1994 in music . Track listing Morphology 9 28 TransHumanist 10 11 Shockwave 8 33 Dimensional Space 5 27 Hypoxia 8 50 Otherworld 4 49 In Four Dimensions 12 31 Other Released September 9, 1994 Genre Electronic Ambient Worldbeat Producers Bill Leeb, Rhys Fulber Delerium 1990s electronic album stub Category Delerium albums Category 1994 albums ... more details
italictitle Spheres of Justice A Defense of Pluralism and Equality is a book written by Michael Walzer ISBN 0 465 08189 4 . In it, Walzer argues in favour of an idea he calls complex equality , and against the view that good economics goods with different meaning and content can be lumped together into the larger category of primary goods , as is advocated by John Rawls , in his A Theory of Justice from 1971. The book might be considered an attempt, from a liberal starting point, to bridge some of the disagreements between liberalism liberals and communitarianism communitarians in political philosophy . External links http books.google.com books?id 2ndITi80AcsC&printsec frontcover&source gbs summary r&cad 0 preview through Google Books large images Category 1983 books Category books in political philosophy Poli book stub de Spheres of Justice ... more details
Multiple issues orphan August 2009 wikify August 2009 Separate Spheres is a concept within Women s history Women s History and Gender history Gender History that describes the split dominions of the home and public spheres along gender lines, primarily in 19th Century Britain, although the ideology was present at work in the Americas as well. The notion of separate spheres dictated that men, based primarily on their biological makeup as well as the will of God deserved power in the public sphere, that of the economy, commerce, politics, etc. whereas women, for similar reasons, were confined to the private sphere domestic life and all that implied, such as child rearing, housekeeping, and religious education. ref http www.jrank.org history pages 8078 separate spheres.html Separate Spheres ref It was originally thought of by most men and women to be natural and even affirming for women, evidenced by the observations of French political thinker Alexis de Tocqueville in his Democracy in the Americas there is an entire chapter devoted to the roles of American women, in which he says, As for myself, I do not hesitate to avow that although the women of the United States are confined within the narrow circle of domestic life, and their situation is in some respects one of extreme dependence, I have nowhere seen women occupying a loftier position and if I were asked, to what the singular prosperity and growing strength of the American people ought mainly to be attributed, I should reply To the superiority of their women. ref Alexis de Tocqueville, Democracy in America 2 vols., New York, 1945 , II, bk. 3, ch. 9 12, esp. 201, 211, 214 ref Feminists, Traditionalists, academics and critics ... unable to participate in the public sphere. The notion of separate spheres managed to prevail in the dominant ... Dr Cathy Ross suggested, in her paper Separate Spheres or Shared Dominions that when the system was applied to individual cases, the theory of Separate Spheres proved to be inaccurate. ref http rspas.anu.edu.au ... more details
Image Dandelin1.png right frame Dandelin spheres are touching the light blue plane that intersects the cone. In geometry , the Dandelin spheres are one or two sphere s that are tangent both to a plane and to a cone that intersects the plane. The intersection of the cone and the plane is a conic section , and the point at which either sphere touches the plane is a Focus geometry focus of the conic section, so the Dandelin spheres are also sometimes called focal spheres . ref name Taylor Taylor, Charles ... 196 focal spheres , http books.google.com books?id LBwPAAAAIAAJ&pg PA204&dq 22hugh hamilton 22 sphere&as ... . ref The Dandelin spheres were discovered in 1822. ref name Taylor They are named in honor of the Belgium ... for hyperbola Cambridge University Press, 2005 . ref The Dandelin spheres can be used to prove at least ... , but the Dandelin spheres facilitate the proof. ref name Heath The second theorem is that for any ... spheres facilitate the proof. ref name Heath A conic section has one Dandelin sphere for each focus. In particular, an ellipse has two Dandelin spheres, both touching the same Nappe disambiguation nappe of the cone. A hyperbola has two Dandelin spheres, touching opposite nappes of the cone ... Dandelin spheres are shown, one G1 above the ellipse, and one G2 below. The intersection of each ..., a parabola has only one Dandelin sphere, and thus has only one directrix. Using the Dandelin spheres ... of Alexandria were aware of this property, but the Dandelin spheres facilitate the proof. ref ..., 1921 . ref Neither Dandelin nor Quetelet used the Dandelin spheres to prove the focus directrix ... Notes references External links http www.clowder.net hop Dandelin Dandelin.html Dandelin Spheres page by Hop David MathWorld id DandelinSpheres title Dandelin Spheres http www.mathacademy.com pr prime articles dandelin index.asp Math Academy page on Dandelin s spheres http www.liceomendrisio.ch marsan ... sections Category Euclidean solid geometry Category Spheres ar de Dandelinsche Kugel ... more details
The cosmological model of concentric or homocentric spheres , developed by Eudoxus , Callippus , and Aristotle , employed celestial spheres all of which had the same center, the Earth. ref Citation last Neugebauer first Otto author link Otto Neugebauer title A History of Ancient Mathematical Astronomy place Berlin Heidelberg New York publisher Springer Verlag year 1975 volume 2 pages 677 85 isbn 0 387 06995 X ref ref Citation last Lloyd first G. E. R. author link G. E. R. Lloyd title Aristotelian Explorations place Cambridge publisher Cambridge University Press origyear 1996 year 1999 chapter Heavenly aberrations Aristotle the amateur astronomer pages 167 8 isbn 0 521 55619 8 ref In this respect it differed from the epicycle epicyclic and eccentric models with multiple centers, which were used by Ptolemy and other mathematical astronomers until the time of Copernicus . Notes reflist Category Ancient Greek astronomy Category Early scientific cosmologies ... more details
audiences may place topics in different spheres. This theory assumed that all media shares .... WNYMedia.net, 2009. DEFAULTSORT Hallin s Spheres Category Journalism ... more details
seealso Bucket argument Inertial frame of reference Isaac Newton s rotating spheres argument attempts ... the tension in the string joining two identical spheres. The basis of the argument is that all observers ... and the rate of rotation of the spheres which is different for observers with differing rates ... stars . In the 1846 Andrew Motte translation of Newton s words ref name spheres See the Principia ... Newton s laws do not apply, so the experiment really only shows what happens when the spheres ... and Inertia , p. 387 An interpretation that avoids this conflict is to say that the rotating spheres ... spheres tied with a string and rotating at an angular rate . Because of the rotation, the string tying the spheres together is under tension. Image Rotating sphere forces.PNG thumb Figure 2 Exploded view of rotating spheres in an inertial frame of reference showing the centripetal forces on the spheres ... this observation are presented. Figure 1 shows two identical spheres rotating about the center of the string ..., not just these spheres. In resisting this ubiquitous centrifugal force, the string is placed under tension, accounting for their observation, despite the fact that the spheres are at rest. ref name Knudsen ... main Coriolis effect What if the spheres are not rotating in the inertial frame string tension is zero ? Then string tension in the rotating frame also is zero. But how can that be? The spheres in the rotating ... of rotation to one of the spheres, and is a vector representing the angular rotation, with magnitude ... of the ball, and R is the distance from the axis of rotation to the spheres the magnitude of the displacement vector, x sub B sub R , locating one or the other of the spheres . According to the rotating ... case, according to the rotating observer the spheres now are moving, and the Coriolis force which ... in the string the Coriolis force looks after everything. General case What happens if the spheres ... exerts a centripetal inward force on the spheres of math mathbf T m omega I 2 R mathbf u R . math This force ... more details
Unreferenced date December 2009 Infobox Album See Wikipedia WikiProject Albums Name Heavenly Spheres Type studio Artist Studio de musique ancienne de Montr al Cover Heavenlysphere01.jpg Released Recorded 1998 Genre A cappella choir choral Length Label Producer Reviews Last album This album Next album Heavenly Spheres L Harmonie des Sph res is an a cappella choral album by the Studio de musique ancienne de Montr al under the direction of Christopher Jackson keyboardist Christopher Jackson . Recorded in 1998, it features songs from the late 15th to early 16th century. It was awarded a F lix Award from the ADISQ and the Juno Award for Classical Album of the Year Vocal or Choral Performance in 2000. The album includes performances of compositions by Nicolas Gombert , Roland de Lassus , Giovanni Pierluigi da Palestrina , Josquin des Prez , and others. Track listing Musae Jovis , the lament on the death of Josquin des Prez , for 6 voices by Nicolas Gombert Inviolata, integra et casta es , motet for 5 voices by Josquin des Prez Motet Tulerunt Dominum meum for 8 voices by Nicolas Gombert Nesciens Mater Virgo Virum , for 8 voices by Jean Mouton Andreas Christi famulus for 8 voices, motet by Crist bal de Morales Salve Regina , motet for 4 voices from Motets Book II by Giovanni Pierluigi da Palestrina Beatus Laurentius , motet for 5 voices by Giovanni Pierluigi da Palestrina Omnes de Saba venient , motet for 8 voices, M. xix S. xxi 1 by Orlande de Lassus Litaniae de beata virgine Maria , litany for 6 voices by Giovanni Pierluigi da Palestrina Vidi speciosam , motet for 6 voices by Tom s Luis de Victoria Ascendente Jesu in Naviculam , for 6 voices, W xvi, 23 by Giaches de Wert Peccavi super numerum by Giaches de Wert Category 1998 albums Classical album stub ... more details
SIR Spheres microspheres is used to treat patients with unresectable liver cancer . These are mostly patients with hepatocellular carcinoma HCC , metastatic colorectal cancer mCRC , or metastatic neuroendocrine tumours mNET . ref J.I.Bilbao & M.F.Reiser Liver Radioembolization with Yttrium 90 Microspheres, Springer 2008 ISBN 978 3 540 35421 5 ref In the US the product is only approved for the treatment of mCRC ref A.Kennedy et al. Int.J.Radiation Oncology Biol Phys., Vol.68, No 1, pp13 23, 2007 ref . Therapy goals are local disease control, downstaging to resection, bridging to transplantation, and extended survival ref R.Salem et al J.Vasc Intervent Radiol 2006 17 1251 1278 ref . Description SIR Spheres microspheres contain resin based microspheres with an average diameter between 20 and 60 micrometre . The microspheres are impregnated with Isotopes of yttrium sup 90 sup Y , a Beta decay beta radiating isotope of yttrium with a half life of 64.1 hours. ref http www.sirtex.com content.cfm?sec usa&MenuID 1120 ref Mode of Action Once injected into the hepatic artery via a catheter by an Interventional Radiologist the microspheres will preferably lodge in the vasculature of the tumour. The radiation will lead to damage of tumour tissue and, in the best case to a complete elimination of the tumour. Due to the half life almost all of the radiation is delivered within 2 weeks. After 1 month almost no radioactivity will be remaining. The procedure is also known as Selective Internal Radiation Therapy or Radioembolisation. See also TheraSphere Sirtex References Reflist External links http www.sirtex.com Sirtex http www.insideradiology.com.au pages view.php?T id 32 Insider Radiology Categories Category Radiation oncology ... more details
This article describes the packing of circles on surfaces. For the related article on circle packing with a prescribed intersection graph , please see the circle packing theorem . Image Citrus fruits.jpg ... , circle packing is the study of the arrangement of circles of equal or varying sizes on a given surface such that no overlapping occurs and so that all circles touch another. The associated packing ... can be made to higher dimensions &ndash this is called sphere packing , which usually deals only with identical spheres. The branch of mathematics generally known as circle packing , however, is not overly concerned with dense packing of equal sized circles the densest packing is known but with the geometry ... packing density, it does not have the lowest possible. The worst shape to pack onto a plane is not known, but the smoothed octagon has a packing density of about 0.902414, which is the lowest maximum packing density known of any centrally symmetric convex shape. ref MathWorld urlname SmoothedOctagon title Smoothed Octagon ref Packing densities of concave shapes such as star polygon s can be arbitrarily small. Packings in the plane File Circle packing hexagonal .svg thumb left Identical circles in a hexagonal packing arrangement, the densest packing possible. In two dimensional Euclidean ... density is the hexagon al packing arrangement, ref name ChangWang in which the centres of the circles ... eprint 1009.4322v1 title A Simple Proof of Thue s Theorem on Circle Packing class math.MG ... circles Circle packing in a square packed within the smallest possible square . Only four equilateral triangles are formed by adjacent circles. Packing problem Packing circles Packing circles in simple ... walls is important, and hexagonal packing is generally not optimal for small numbers of circles. Unequal circles File 2 d dense packing r1.svg thumb left A compact binary circle packing with the most ... compact packing , which is when every pair of circles in contact is in mutual contact with two other ... more details
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