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Topic: EPR


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In the News (Mon 21 Dec 09)

  
  EPR paradox - Wikipedia, the free encyclopedia
In quantum mechanics, the EPR paradox (Einstein-Podolsky-Rosen) is a thought experiment which challenged long-held ideas about the relation between, on the one hand the observed values of physical quantities and on the other, the values that can be accounted for by a physical theory.
The EPR paradox draws on a phenomenon predicted by quantum mechanics, known as quantum entanglement, to show that measurements performed on spatially separated parts of a quantum system can apparently have an instantaneous influence on one another.
In the many-worlds interpretation, a kind of locality is preserved, since the effects of irreversible operations such as measurement, arise from the relativization of a global state to a subsystem such as that of an observer.
en.wikipedia.org /wiki/EPR_paradox#Description_of_the_paradox   (3009 words)

  
 The Einstein-Podolsky-Rosen Argument in Quantum Theory
The unreasonableness to which EPR allude in making "the reality [on the second system] depend upon the process of measurement carried out on the first system, which does not in any way disturb the second system" is just the unreasonableness that would be involved in renouncing locality itself.
EPR is about the interpretation of state vectors ("wave functions") and employs the standard state vector reduction formalism (von Neumann's "projection postulate").
To go back to the EPR dilemma between locality and completeness, it would appear from the Bell theorem that Einstein's strategy of maintaining locality, and thereby concluding that the quantum description is incomplete, may have fixed on the wrong horn.
plato.stanford.edu /entries/qt-epr   (7636 words)

  
 What is EPR?   (Site not responding. Last check: 2007-10-20)
Electron paramagnetic resonance (EPR), also known as electron spin resonance (ESR) and electron magnetic resonance (EMR), is the name given to the process of resonant absorption of microwave radiation by paramagnetic ions or molecules, with at least one unpaired electron spin, and in the presence of a static magnetic field.
EPR spectroscopy, combined with techniques such as spin trapping, can be used to detect and follow free radical reactions in biological systems.
Low-frequency EPR spectrometers and special microwave detectors and circuitry provide the capability to obtain spectra from living animals and perfused organs, including the concentration of oxygen in tissues, redox metabolism, distribution of spin-labeled molecules, and biophysical measurement.
ierc.scs.uiuc.edu /epr.html   (570 words)

  
 EPR And Our Daily Life - Connections May 2003   (Site not responding. Last check: 2007-10-20)
EPR (Electron Paramagnetic Resonance), also known as ESR (Electron Spin Resonance), is used to detect unpaired electrons.
EPR is a twin sister of NMR (Nuclear Magnetic Resonance) or more popular, MRI (Magnetic Resonance Image), the term you often hear at hospitals.
EPR is a very useful tool to check the exhausted gas...
www.niehs.nih.gov /Connections/2003/may/epr.htm   (383 words)

  
 Strategies To Promote Clean Production - EPR
The aim of EPR is to encourage producers to prevent pollution and reduce resource and energy use in each stage of the product life-cycle through changes in product design and process technology.
EPR is still in its infancy and time will tell if legislation will promote no use, extended use and reuse - and thus a drop in resource consumption - versus an expanded recycling industry that simply perpetuates resource intensive and hazardous production for expanding markets.
If EPR is to strengthen this transition, governments will need to ensure public access to information, bans and phase-outs on the production and use of hazardous substances, as well as 'strict joint and several' liability for environmental and human health damage.
www.grrn.org /resources/BevEPR.html   (6090 words)

  
 European Pressurized Reactor - Wikipedia, the free encyclopedia
A demonstration EPR reactor will be built in France in Flamanville in the Manche département, to be operational in 2012 [2] [3].
There is a bidding in process to build four new EPR reactors to China [4], and an intent to market EPRs in the U.S. with Constellation Energy [5].
International Call against EPR Although the EPR is totally different from the RBMK (or the Candu).
en.wikipedia.org /wiki/European_Pressurized_Reactor   (330 words)

  
 EPR: What Does It Mean? Where Is It Headed?
EPR legislation for EEE has already been adopted in Switzerland, the Netherlands, Italy, and Norway, and is close to adoption in many other countries.
The target for EPR is the remaining 25 percent: the mixed materials (plastic, rubber, glass, textiles, fluids, and paint) that are often contaminated with hazardous substances such as lead, cadmium, waste oil, and PCBs.
EPR programs driven by the threat of legislation are not truly voluntary, and fall midway along the continuum.
www.informinc.org /eprppr.php   (6652 words)

  
 Mexico's Other Insurgents - The US Army on the EZLN and the EPR   (Site not responding. Last check: 2007-10-20)
The EPR confirmed it was a genuine force in a 7 August interview with selected journalists at a hidden spot in the Sierra Madre del Este, a mountain range that runs north through Oaxaca, San Luis Potosi, Veracruz, Hidalgo and Tamaulipas.
EPR guerrillas blocked roads and distributed pamphlets in Chiapas and seized a radio station in Tabasco.[35] Shootings and propaganda activity were reported in Guanajuato state, evidently without casualties.
The EPR's presence may extend into as many as 11 states.[36] Interviews, communiques, two election cease-fires and proselytizing activities have kept the EPR in the public eye, even as the Mexican army and police arrest suspects and establish a large, visible presence in all affected areas.
flag.blackened.net /revolt/mexico/usa/army_on_epr.html   (5559 words)

  
 EPR Working Group
EPR is a tool to ensure responsibility is placed on the party with the greatest ability to reduce the environmental and human health impacts of products: the brand owner.
EPR encourages producers to create products that last longer and manage materials so they are continually reused and recycled in a closed loop system.
EPR programs ensure that people in industrialized and developing countries are not exposed to toxic materials in their workplaces or their communities.
www.eprworkinggroup.org /index.php   (1410 words)

  
 NIST Electron Paramagnetic Resonance Facility
In the EPR measurement, irradiated materials are placed in a magnetic field and electron spin transitions are induced by an electromagnetic field of the appropriate frequency (typically in the GHz range).
EPR is used as a non-destructive probe of the structure and concentration of paramagnetic centers.
Capabilities: The EPR dosimetry facility is supported by three state-of-the-art X-band EPR spectrometers capable of measuring radiation effects on a wide range of materials from inorganic semiconductors to biological tissues.
physics.nist.gov /MajResFac/elec.paramag.html   (353 words)

  
 EMSL: Spectrometer: EPR/ESR, Continuous Wave   (Site not responding. Last check: 2007-10-20)
Two types of EPR spectrometers are in use at EMSL: (1) a multi-frequency continuous-wave system located in the Environmental Spectroscopy and Biogeochemistry Facility, and (2) an X-band pulsed (Fourier-transform) system.
The primary use of EMSL's multi-frequency continuous-wave EPR spectrometer is to study the aqueous environmental surface chemistry of minerals and organo-mineral composites found in soils and sediments.
Under the right conditions, EPR spectroscopy has the ability to characterize the local chemical environment of paramagnetic transition-metal and rare-earth ions present in the lattice, in the interlayer region, or adsorbed to the surface of clays.
www.emsl.pnl.gov /capabs/instruments/instrument_pages/1079.shtml   (1141 words)

  
 The DCIF EPR Training Page
Electron-paramagnetic-resonance (EPR) also referred to as electron-spin-resonance (ESR) spectroscopy measures the absorption of microwave radiation corresponding to the energy splitting of the unpaired electron when it is placed in a strong magnetic field.
In a typical EPR instrument, a klystron tube is used to generate monochromatic microwave radiation in the ~9.75 GHz (known as the X-band) region.
EPR spectra are usually displayed in derivative form to improve the signal-to-noise ratio.
web.mit.edu /speclab/www/eprtrain.html   (2498 words)

  
 Brain.Save() - EPR's and identifiers   (Site not responding. Last check: 2007-10-20)
And then there's a third camp, which treats EPR's as a way for a service provider to communicate to a client what SOAP headers need to be present inside of a message in order for that service provider to make an attempt at processing that envelope.
EPR's are only present on the wire in their unbound form when they're stored for later use.
The SOAP binding for EPR's has an interesting implication (one that is itself a topic of significant debate): you can't look at a SOAP message and determine the EPR to which it was addressed.
hyperthink.net /blog/PermaLink,guid,5108aad7-342a-411a-b87c-bd4eec92a895.aspx   (1537 words)

  
 Dr Sue Jennings and EPR
EPR is 'value free': it does not rely on a particular school of psychological theory, indeed it can be integrated into any psychological model or therapeutic or educational practice.
EPR charts the 'dramatic development' of children, which is the basis of the child being able to enter the world of imagination and symbol, the world of dramatic play and drama.
EPR can be integrated into all approaches of psychology and play therapy although it works more efficiently where therapist and child can co-create the scenes and activities together.
www.suejennings.com /epr.html   (3065 words)

  
 Does the EPR paradox prove that quantum theory is incomplete? Philosophy of Science at AhISee - the site for Insight
The EPR argument was the last of these many attempts by Einstein to present a reductio ad absurdem in the form of a thought experiment that would disestablish the prevalent acceptance of the CHI.
EPR argues that the CHI involves non-locality – in Einstein's phrase, “creepy action at a distance”.
The EPR argument of course was intended to show that QM was 'incomplete' by demonstrating an 'impossible' implication, and therefore that there were other factors – 'hidden variables' of reality – that were mediating the visible transactions between the separated particles.
www.ahisee.com /content/epressay.html   (4612 words)

  
 The EPR Paradox and Bell's Inequality Principle
This article is an introduction to EPR, Bell's inequality, and the real experiments that have attempted to address the interesting issues raised by this discussion.
EPR sought to demonstrate that this phenomenon could be exploited to construct an experiment that would demonstrate a paradox which they believed was inherent in the quantum-mechanical description of the world.
If EPR were correct, each photon will simultaneously have properties for spin in each of axes x, y and z.
math.ucr.edu /home/baez/physics/Quantum/bells_inequality.html   (2076 words)

  
 Welcome to EPR
While much of EPR's work comprises ad hoc projects, we also undertake a number of regular tracking studies, both in person and on the telephone.
EPR is also accustomed to working on sensitive issues.
All group moderation is undertaken by EPR directors and senior staff.
www.epr-uk.com /services.htm   (282 words)

  
 EPR Spectra Simulation of Anisotropic Spin 1/2 System
An oscillating magnetic field at right angles to the field axis induces transitions between the two spin states when the frequency of the field is at or near the Larmor frequency of the precessing electron.
The program for simulation of EPR spectrum of S=1/2 system is also derived from the program to simulate high spin systems (S = 3/2, 5/2, 7/2, 9/2).
Simulated EPR spectra of S=1/2 with g = 2.03, 2.02,2.00 by using lineshape of mixture of  gaussian and lorentzian (W436 means Wx=4 G, Wy=3G,Wz=6 G respectively).
www.ch.ic.ac.uk /watoc/abstracts/01   (1229 words)

  
 EPR - Einstein, Podolsky and Rosen
EPR discussed such systems as a way of critiquing what they called the completeness (as opposed to the correctness) of the quantum description.
In 1964 John Bell used David Bohm's version of EPR's argument to ironically rule against them: EPR's assumption of locality is found to be false, releasing quantum theory from any claim of incompleteness or inconsistency.
The line of argument initiated by EPR was formally updated in 1964 when John Bell showed that the assumption of locality made by Einstein, Podolsky and Rosen was itself actually in contradiction with facts predicted by quantum mechanics.
www.nonlocal.com /hbar/epr.html   (425 words)

  
 Metretek, Inc.
The AE6000 EPR is a stand-alone, microprocessor-controlled electronic pressure recorder (EPR) with integral pressure and/or temperature transducers.
The EPR is not limited to monitoring and recording: its unique design and deployment of our process concept allows a variety of additional functions.
The intrinsically safe design of the EPR permits operation in a Class 1, Division 1, Group D environment (intrinsically safe barriers are required in such an environment when using telephone connections and/or AC power.
www.metretekfl.com /epr6.html   (1134 words)

  
 EPR Cable
has formed an EPR Cable Technology Consortium for the purpose of advancing EPR cable technology to the benefit of Consortium Sponsors and the public through (i) improved understanding of properties of EPR cable dielectric and the resulting cable and (ii) the implications of such properties for user applications.
The intention of the Consortium is to advance knowledge and understanding of EPR cable technology, and to this end, all data and knowledge resulting from work sponsored by the Consortium can be made available to the public and published subject to appropriate review by Consortium members to assure that such information is technically accurate.
EPR cable is relatively immune to the water treeing phenomenon [2], and has provided reliable service for over 30 years
www.ims.uconn.edu /~eprcable   (1568 words)

  
 Experiment 7. ESR Spectroscopy. Introduction
In both EPR and NMR, the sample material is immersed in a strong static magnetic field and exposed to an orthogonal low- amplitude high-frequency field.
This is a typical mode of EPR signal detection: microwave frequency is kept constant and magnetic field is varied
There are variety of schemes for detecting resonant EPR transitions.
www.chemistry.nmsu.edu /studntres/chem435/Lab7/intro.html   (2149 words)

  
 EPR Group Limited, comprise EPR Architects, EPR Interiors and EPR Modelmaking. Building types include offices, business ...
EPR Group Limited, comprise EPR Architects, EPR Interiors and EPR Modelmaking.
EPR are based in London,UK Welcome to the EPR Web site.
EPR Group, comprising EPR Architects, EPR Interiors and EPR Modelmaking, is an established practice of architects and interior designers based in London, operating throughout the UK, Europe and Asia.
www.epr.co.uk   (90 words)

  
 EPR   (Site not responding. Last check: 2007-10-20)
EPR is a useful tool which allows the observer to deduce many things about a particular sample.
EPR reveals the existence of unpaired electrons and (by looking at the hyperfine splitting) one can also determine some characteristics of the orbital of the unpaired electrons.
Abragam and Bleaney, EPR of Transition Ions, Oxford, 1970.
galileo.phys.virginia.edu /classes/317/epr/epr.html   (1650 words)

  
 What is Wrong with EPR? A Critical Review of Einstein, Podolsky, and Rosen's 1935 paper.
EPR's use of 'complete' follows their classical presumption that a theory must be global, and for a theory to be global, in general, it must state all truths about any system it is describing.
EPR's use of 'physical quantities' means that they presume classical reality is stable and that, in general, physically state-ic, quantitative measurement of physical, objective properties is possible.
EPR complain about this aspect of their view of 'quantum mechanics.' Since a quantum particle's coordinate location is probabilistic, "A definite value of the coordinate, for a particle...is thus not predictable, but may be obtained only by a direct measurement.
www.quantonics.com /What_Is_Wrong_With_EPR.html   (7856 words)

  
 EPR Known Bugs
The EPR team is actively working with HP on this issue and will continue to share updates as they are available.
Symptom: When attempting to import a document into EPR that was not originally created in EPR, this message is displayed and the import is not completed.
Resolution: When EPR is not in use for a period of time, the user should logout of EPR and when the user signs back on the connectivity will be there.
dcs.jhmi.edu /epr/Problems.cfm   (1439 words)

  
 PAN - Employee Productivity Report (EPR)
The EPR is comprised of a total of 60 items-- 30 behavioral and attitudinal items rated on 4-point scales and 30 “admissions” items that tap into the applicant’s past behaviors.
By assessing candidate attitudes and behaviors deemed to be the strongest predictors of future job performance, the EPR helps to identify those candidates most likely to perform their work at the highest and most efficient levels and to avoid engaging in counterproductive behaviors.
The EPR is legally compliant at local, state and federal levels.
www.pantesting.com /products/reid/EPR.asp?test_id=-1   (201 words)

  
 WS-Addressing Additions and Updates (Web Services Technical Articles)
The reference properties in an EPR are promoted to SOAP headers in messages sent to the EPR.
The drawback is it requires the EPR to use SOAP version 1.1.
As described in the security considerations section, EPRs should be signed to prevent tampering and, as with all cryptographic signatures, a process must never sign data that does not reflect its intent.
msdn.microsoft.com /library/en-us/dnwebsrv/html/wsaddressdelta.asp   (1622 words)

  
 Framatome ANP GmbH - Innovative Reactor Concepts: EPR
The EPR development project, conducted as a French-German cooperation in conjunction with Framatome ANP as well as EDF and German electric utilities, gathers together all of the know-how and experience previously gained with German and French pressurized water reactors.
By combining a high degree of redundancy with safety functions of diverse design for the same safety objectives, the already low probability of occurrence of severe accidents will be significantly reduced with the EPR.
Economic efficiency will be assured by a plant capacity of 1550 MW in conjunction with increased operational flexibility, enhanced fuel utilization and high availability.
www.de.framatome-anp.com /anp/e/foa/anp/products/epr/s11_1.htm   (126 words)

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