ASC 2006 Harnessing the Magic. Links to calls for papers, venue. 6 days in Jacksonville, Florida, USA. http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126
Superconductors superconductors also have interesting magnetic properties; they are perfect Despite these interesting properties, superconductors are not widely used in http://theory.uwinnipeg.ca/mod_tech/node107.html
Extractions: Superconductors An extreme example of a diamagnet is a superconductor . These materials are known primarily through their electrical properties - at some relatively low temperature their electrical resistance is exactly zero. Thus, one can establish a current in a superconductor and it will never die away due to resistance, even when the source of potential difference that started the current is removed. Superconductors also have interesting magnetic properties; they are perfect diamagnets: when an applied magnetic field is applied, eddy currents in the superconductor induce a magnetic field which exactly cancels the applied magnetic field. This is the Meissner effect This effect is responsible for the magnetic levitation of a magnet when placed above a superconductor. Suppose, as in Fig. , we place a magnet above a superconductor. The induced magnetic field inside the superconductor is exactly equal and opposite in direction to the applied magnetic field, so that they cancel within the superconductor. What we then have are two magnets equal in strength with poles of the same type facing each other. These poles will repel each other, and the force of repulsion is enough to float the magnet. Such magnetic levitation devices are being tried on train tracks in Japan; if successful, this would make train travel much faster, smoother, and more efficient due to the lack of friction between the tracks and train (in some cases, rather than superconductors, strong electromagnets are used to provide the magnetic levitation).
McDevitt Group Materials and solid state chemistry including superconductors and taste chips. http://neon.cm.utexas.edu/mcdevitt/
Intermagnetics General Corporation Introduction IGC is a developer and manufacturer of superconducting materials, radiofrequency coils, magnets, superconducting wire, cable and tape, and related http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126
Diamagnets And Superconductors Diamagnets and superconductors. Diamagnets and superconductors. There existsa class of materials called diamagnets which exhibit some interesting http://theory.uwinnipeg.ca/mod_tech/node106.html
Extractions: Diamagnets and superconductors There exists a class of materials called diamagnets which exhibit some interesting properties when an external magnetic field is applied. In these materials, eddy currents consisting of circulating electrons are induced whose magnetic effects are such as to cancel part of the applied external field (typically about 0.1%). A metal detector is a device which relies on this property. In this device, a magnetic field is generated from an electromagnet, which causes eddy currents to be produced. The magnetic fields from the induced currents are in turn picked up by the detector in the form of small currents being produced. Most diamagnetic materials are metals, which have good electrical conductivity properties and so the eddy currents can be relatively easily established. This is the reason these detectors can readily sense metallic objects but not plastics or other poor conductors.
Welcome To Dr. Zhi Gang Yu's Web Site Research physicist studying spindependent transport in organic materials and devices, DNA and proteins, conducting polymers, and high-temperature superconductors. http://aristotle.sri.com/~zyu/
American Magnetics, Inc. Home Page AMI is an engineering and manufacturing firm specializing in superconducting magnet design and manufacturing. In Oak Ridge, Tennessee. http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126
Arbiol, Jordi Ph.D. in Physics and Associate Professor (Universitat de Barcelona, Spain). Research areas Nanostructured Materials, Transmission Electron Microscopist and Microanalyst, Semiconductor Gas Sensor materials, Mesoporous materials, IIIV and II-IV semiconductor compounds, superconductors, Metals and Nanostructure. http://nun97.el.ub.es/~arbiol/cv_ang.html
Superconductors A Guide To Resources On The Web Provides links to web resources on all aspects of superconductors, including research and development, applications, producers, education and public http://tmsyn.wc.ask.com/r?t=an&s=hb&uid=24312681243126812&sid=343126
Making Matter: Superconductors Neutron diffraction from oxide superconductors indicated that oxidation ofthese ¶charge reservoir layers results in the formal oxidation of the planes of http://www.ill.fr/dif/3D-crystals/superconductors.html
Extractions: Oxides like silica are normally insulators because the electrons are intimately associated with the individual bonds or ions. Metals can conduct because the electrons are relatively free. But there are oxides that can become metallic conductors, or even superconductors. The most interesting contain "mixed valence" atoms such as copper that can give up a variable number of electrons when bonding. According to Pauling's ideas about chemical bonds, by looking at the co-ordination of these atoms, we can usually tell something about their valence. For example, look at the co-ordination of copper in one of the new ceramic oxide superconductor . The copper (Cu) are the green atoms, the oxygen are as usual red and barium is blue. Clearly there are two kinds of copper atom - those that are co-ordinated by 4 oxygen atoms (green squares), typical of divalent Cu++, and those that have a fifth oxygen atom (green pyramids). This material has zero electrical resistance even above the temperature of liquid air - cold but easy to produce and handle. This is truly amazing, and a few years ago would have been thought impossible. If we heat this remarkable superconductor in the absence of oxygen it loses one of its oxygen atoms and becomes the insulator with a very similar structure. The oxygen is lost from one particular site; the chains of CuO4 squares. Copper in these squares is left with only two oxygen atoms, typical of monovalent Cu+. Copper is said to have been "reduced" from Cu++ to Cu+. Oxygen and superconductivity can be restored by "oxidising" the copper again from Cu+ to Cu++. This solid state chemistry is clearly responsible for the unusual electrical properties.
Molecular Expressions: Images From The Microscope Hundreds of photomicrographs (photographs through the microscope) of everything from superconductors and hightech materials to ice cream and beer. http://micro.magnet.fsu.edu/index.html
Extractions: Welcome to the Molecular Expressions website featuring our acclaimed photo galleries that explore the fascinating world of optical microscopy. We are going where no microscope has gone before by offering one of the Web's largest collections of color photographs taken through an optical microscope (commonly referred to as "photo-micro-graphs"). Visit our Photo Gallery for an introductory selection of images covering just about everything from beer and ice cream to integrated circuits and ceramic superconductors. These photographs are available for licensing to commercial, private, and non-profit institutions. Secret Worlds: The Universe Within - Soar through space starting at 10 million light years away from the Milky Way down through to a single proton in Florida in decreasing orders of magnitude (powers of ten). This tutorial explores the use of exponential notation to understand and compare the size of things in our world and the universe, and provides a glimpse of the duality between the macroworld around us and the hidden microworld within. NEW! -
Superconductivity - Uses Of Superconductors 2nd year chemistry web project a small web site about the phenomenon ofsuperconductivity. http://www.chemsoc.org/exemplarchem/entries/igrant/uses_noflash.html
Extractions: Superconductors have many uses - the most obvious being as very efficient conductors; if the national grid were made of superconductors rather than aluminium, then the savings would be enormous - there would be no need to transform the electricity to a higher voltage (this lowers the current, which reduces energy loss to heat) and then back down again. Superconducting magnets are also more efficient in generating electricity than conventional copper wire generators - in fact, a superconducting generator about half the size of a copper wire generator is about 99% efficient; typical generators are around 50% efficient. The US Department of Energy are actively encourages the use of superconductors as energy efficient devices. At the moment, the problem lies with the critical temperature - unless a material is found that can superconduct above 300K, some sort of cooling system needs to be employed, which would be expensive, although companies are developing prototypes - in December 1998, Pirelli Wire built a test 150ft cable that transmitted electricity using high temperature superconducting materials.
First Principles Research Ab initio quantum chemistry and computational studies of superconductors. http://www.firstprinciples.com/
Extractions: The primary focus of First Principles Research is to provide expertise in computational chemistry and physics to a variety of industries. Our resources are devoted to a mixture of consulting, contract research, and basic research. Projects First Principles Research has been involved with since its founding in 1994 include high temperature superconductivity, kinetic models for oil hydrocracking and gasoline reforming, physical and numerical models for medical devices and airborne/space-based radar. Details on this and other work can be found at this website. For additional information, please contact us directly as indicated below. General Information: jkp@firstprinciples.com
Molecular Expressions: Images From The Microscope Features hundreds of photomicrographs (photographs through the microscope) of everything from superconductors and hightech materials to ice cream and beer. Also includes tutorials about microscopy and optics. http://micro.magnet.fsu.edu/
Extractions: Welcome to the Molecular Expressions website featuring our acclaimed photo galleries that explore the fascinating world of optical microscopy. We are going where no microscope has gone before by offering one of the Web's largest collections of color photographs taken through an optical microscope (commonly referred to as "photo-micro-graphs"). Visit our Photo Gallery for an introductory selection of images covering just about everything from beer and ice cream to integrated circuits and ceramic superconductors. These photographs are available for licensing to commercial, private, and non-profit institutions. Secret Worlds: The Universe Within - Soar through space starting at 10 million light years away from the Milky Way down through to a single proton in Florida in decreasing orders of magnitude (powers of ten). This tutorial explores the use of exponential notation to understand and compare the size of things in our world and the universe, and provides a glimpse of the duality between the macroworld around us and the hidden microworld within. NEW! -
High Temperature Superconductors The high temperature superconductors are ceramic materials with layers ofcopperoxide spaced Energy Gap in superconductors as a Function of Temperature http://hyperphysics.phy-astr.gsu.edu/hbase/solids/hitc.html
Extractions: High Temperature Superconductors Ceramic materials are expected to be insulators certainly not superconductors, but that is just what Georg Bednorz and Alex Muller found when they studied the conductivity of a lanthanum-barium-copper oxide ceramic in 1986. Its critical temperature of 30 K was the highest which had been measured to date, but their discovery started a surge of activity which discovered superconducting behavior as high as 125 K. Click on any of the compound formuli for further details. Show phase diagram Index See also June 91 issue of Physics Today ( 7 articles). HyperPhysics Condensed Matter R Nave Go Back Cuprate Superconductor Phases Illustrative of the complexity of the high-temperature superconductor materials is this phase diagram which applies to the cuprate materials. At very low doping, they show the long range order of an antiferromagnet. Doping breaks up the antiferromagnetic order and they become insulators. Only with doping fraction between about 0.1 and 0.2 do they become superconductors. Index
D Wave : The Quantum Computing Company TM DWave Systems (dwavesys.com) is a portal to the state of the art in the design of quantum computers, operating systems, algorithms, hardware, superconductors, and quantum physics. http://www.dwavesys.com
Extractions: A privately-held corporation based in Vancouver, Canada, D-Wave is driving the development of computing platforms which use the principles of quantum mechanics. The company custom designs and builds software programmable superconducting custom integrated circuits, which form the heart of the quantum computer.
Previous Articles Molecular Expressions Photo Gallery The Superconductor CollectionNow known as the Meissner effect, this property of superconductors is often The theory, which is only applicable to lowtemperature superconductors, http://physics.about.com/library/weekly/aa111798.htm?rf=dp&COB=home
Nanoelectronics At The University Of Basel Mesoscopic Physics Group. Research is directed towards static and dynamic electrictransport properties of nanostructures of various kind including normal metals, superconductors, and organic conductors (nanotubes, DNA). http://pages.unibas.ch/phys-meso/
Extractions: INTRODUCTION In march of 1987 Paul Chu and his coworkers (2) reported a yttrium-barium-copper oxide ceramic that had a critical temperature of about 90K, a temperature accessible with relatively cheap liquid nitrogen. Soon, other ceramics were reported where the yttrium ion was replaced with a variety of rare-earth elements. It seemed at the time that a critical temperature in excess of 200K was just around the corner. Early in 1988 a bismuth-copper oxide ceramic containing calcium and strontium was developed by Paul Chu's group that was superconducting at approximately 125K (3). Figure 1. GdBa Cu O Differential Interference Contrast (DIC) reflected light photomicrograph of the surface of a single crystal of GdBa Cu O THE MEISSNER EFFECT One of the most important manifestations of the new high temperature superconducting ceramics is their ability to exclude magnetic fields while in the superconducting state. This property was first recognized in 1933 by a German physicist, Meissner, and, rather than the drop to zero resistance, is the key element used in the demonstration of the superconducting effect. The Meissner effect is the reason behind the levitating of a magnet by a superconductor. The superconductor behaves essentially as a "magnetic mirror", perfectly reflecting the magnetic field lines back to the magnet. The repulsion causes the magnet to rise above the superconductor with it's height being determined by the balance between the field strength and weight of the magnet. This effect is responsible for a host of new applications in electromechanical devices such a frictionless bearings, levitated trains, and superefficient motors.
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