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000011078 0247_ $$2DOI$$a10.1016/j.jmr.2010.09.020
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000011078 041__ $$aeng
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000011078 084__ $$2WoS$$aBiochemical Research Methods
000011078 084__ $$2WoS$$aPhysics, Atomic, Molecular & Chemical
000011078 084__ $$2WoS$$aSpectroscopy
000011078 1001_ $$0P:(DE-Juel1)129422$$aWindt, C. W.$$b0$$uFZJ
000011078 245__ $$aA portable Halbach magnet that can be opened and closed without force: The NMR-CUFF
000011078 260__ $$aAmsterdam [u.a.]$$bElsevier$$c2011
000011078 300__ $$a
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000011078 440_0 $$09881$$aJournal of Magnetic Resonance$$v208$$x1090-7807$$y27 - 33
000011078 500__ $$aRecord converted from VDB: 12.11.2012
000011078 520__ $$aPortable equipment for nuclear magnetic resonance (NMR) is becoming increasingly attractive for use in a variety of applications. One of the main scientific challenges in making NMR portable is the design of light-weight magnets that possess a strong and homogeneous field. Existing NMR magnets can provide such magnetic fields, but only for small samples or in small regions, or are rather heavy. Here we show a simple yet elegant concept for a Halbach-type permanent magnet ring, which can be opened and closed with minimal mechanical force. An analytical solution for an ideal Halbach magnet shows that the magnetic forces cancel if the structure is opened at an angle of 35.3° relative to its poles. A first prototype weighed only 3.1 kg, and provided a flux density of 0.57 T with a homogeneity better than 200 ppm over a spherical volume of 5mm in diameter without shimming. The force needed to close it was found to be about 20 N. As a demonstration, intact plants were imaged and water (xylem) flow measured. Magnets of this type (NMR-CUFF = Cut-open, Uniform, Force Free) are ideal for portable use and are eminently suited to investigate small or slender objects that are part of a larger or immobile whole, such as branches on a tree, growing fruit on a plant, or non-metallic tubing in industrial installations. This new concept in permanent-magnet design enables the construction of openable, yet strong and homogeneous magnets, which aside from use in NMR or MRI could also be of interest for applications in accelerators, motors, or magnetic bearings.
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000011078 588__ $$aDataset connected to Web of Science, Pubmed
000011078 650_2 $$2MeSH$$aEquipment Design
000011078 650_2 $$2MeSH$$aEquipment Failure Analysis
000011078 650_2 $$2MeSH$$aMagnetic Resonance Spectroscopy: instrumentation
000011078 650_2 $$2MeSH$$aMagnetics: instrumentation
000011078 650_2 $$2MeSH$$aMiniaturization
000011078 650_2 $$2MeSH$$aStress, Mechanical
000011078 650_7 $$2WoSType$$aJ
000011078 65320 $$2Author$$aPermanent magnet
000011078 65320 $$2Author$$aHalbach
000011078 65320 $$2Author$$aMagic ring
000011078 65320 $$2Author$$aPlants
000011078 65320 $$2Author$$aGrowth
000011078 65320 $$2Author$$aXylem flow
000011078 65320 $$2Author$$aLong-distance transport
000011078 7001_ $$0P:(DE-HGF)0$$aSoltner, H.$$b1
000011078 7001_ $$0P:(DE-Juel1)129425$$avan Dusschoten, D.$$b2$$uFZJ
000011078 7001_ $$0P:(DE-HGF)0$$aBlümler, P.$$b3
000011078 773__ $$0PERI:(DE-600)1469665-4$$a10.1016/j.jmr.2010.09.020$$gVol. 208$$q208$$tJournal of magnetic resonance$$v208$$x1090-7807$$y2011
000011078 8567_ $$uhttp://dx.doi.org/10.1016/j.jmr.2010.09.020
000011078 8564_ $$uhttps://juser.fz-juelich.de/record/11078/files/FZJ-11078.pdf$$yRestricted$$zPublished final document.
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000011078 9131_ $$0G:(DE-Juel1)FUEK407$$bErde und Umwelt$$kP24$$lTerrestrische Umwelt$$vTerrestrische Umwelt$$x0
000011078 9132_ $$0G:(DE-HGF)POF3-582$$1G:(DE-HGF)POF3-580$$2G:(DE-HGF)POF3-500$$aDE-HGF$$bKey Technologies$$lKey Technologies for the Bioeconomy$$vPlant Science$$x0
000011078 9141_ $$y2011
000011078 915__ $$0StatID:(DE-HGF)0010$$aJCR/ISI refereed
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