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Institute Centenary Symposium, IISC; Future Directions in NMR
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Feature above: Raginiyohn
sey sajaya bharat....
A national song - audio recording from Door Darshan
telecast...
5 minutes duration... manual start
and repeatedly playing..
added on 16th April 2013.
The Sympsium WebSite is at URL: "http://sif.iisc.ernet.in/nmrsymp/"
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Today's date:
This page counter was set on August 28, 2008
COMMENTS AND CLARIFICATIONS: CALCULATING INDUCED FIELD DISTRIBUTION IN SPECIMEN WITH INHOMOGENEOUS
CONSTITUTION; AND, WHEN THE SHAPE IS NOT REGULAR. S.Aravamudhan Department of Chemistry, North Eastern The calculation of induced field distribution
is the procedure by which the Demagnetization factors values can be obtained for homogeneously magnetized specimen. The demagnetization
factor values can be of significance mainly when the specimen is homogenously magnetized. When the material medium is homogeneous,
the magnetization in a magnetic field can be homogeneous only for the regular ellipsoidal shapes, spherical shape being a
special case of the general ellipsoid. The case of a top-shaped and the cylindrically shaped
specimen had been considered earlier (1). These shapes are not ellipsoidal but a simple summation procedure, which can reproduce
the known demagnetization factors, could be used to calculate the induced field contributions within the specimen for the
above two cases of non-ellipsoidal regular shapes. The case of inhomogeneous material medium was considered
in another previous work (2). The above summation procedure could have a simple modification for handling the case of inhomogeneous
material and the method for the calculation of induced field contributions within such specimen was illustrated. The question of whether, any kind of demagnetization
factor can be attributed for such shapes and materials was considered in a much earlier (3) contribution. In view of the micro-macro
paradox in the context of calculation of induced fields as pointed out in a recent contribution (4), the above discussions
(in 1,2 and 3) would be consolidated and clarifications would be added for the necessary significance of the calculation procedures
in the respective contexts. 1. https://nehuacin.tripod.com/id3.html (4th Alpine Conference on SSNMR) 2. http://www.geocities.com/inboxnehu_sa/nmrs2005_icmrbs.html 3. https://nehuacin.tripod.com/id1.html (EUROMAR2006) 4. https://nehuacin.tripod.com/id5.html (EUROMAR2008) Download from this Link: http://ugc-inno-nehu.com/FDNMR_SHEETS_01_20.doc in
a single (MS WORD document) file all the 20 pages of display. CLICK HERE to download an article (MS WORD) on "Dividing a Magnetic Moment and Distributing the Parts, can it ensure a Better
Validity of the Point Dipole Approximation?" [contributed paper for http://www.isc2009nehu.com/ ]
SHEET-01: Contents and index to display sheets SHEET-02:The typical NMR Experiment the results of which required a consideration of this nature: the bulk
susceptibility and contributions to induced field distribution. COMMENT” on the procedure (The context still remains predominantly HR PMR in Single SHEET-03: CLARIFICATION-Reproducing the Standard Values of the Demagnetization
factors is a test for the validity of the Mathematical procedure used for estimating induced field distributions. (Also a note on the first time
occurrence in such experiments) SHEET-04: COMMENT on the necessity of surface charges description. Consolidated
depiction of the situation on the induced field distribution and shape dependent shift/broadening SHEET-05: COMPARISON of standard results of Demagnetization factor and the values obtained by a more convenient
procedure for accounting for the Induced Fields within Magnetized Materials. Equivalence
of the two methods evidenced ---- COMMENT SHEETS-06: COMMENT ----- To describe a Paradoxical Situation: begin with the excerpt copied
from the Reference given below: SHEET-07
&08: CLARIFICATION- on the above paradoxical
situation SHEET-09,10
& 11: Description of convenient summation improving the validity of point dipole
approximation: CLARIFICATION SHEET-12: COMMENT-----Advantages of
the summation method described in the previous sheets: (An alternative method for demagnetization factor calculation) http://www.geocities.com/inboxnehu_sa/nmrs2005_icmrbs.html SHEET-13: CLARIFICATION--- Demagnetization factors for novel combinations of inner
and outer shapes. SHEET-14
& 15: COMMENT On the consideration of unconventional
inner volume elements http://www.geocities.com/saravamudhan1944/eenc_ampere_lille.html SHEET-16: The series of questions, which are being clarified------ CLARIFICATION https://nehuacin.tripod.com/id3.html SHEET-17
& 18: CLARIFICATION Induced Field outside the
specimen: Evidence of the Elegance of approach. SHEET-19
&20: Comments & Clarifications in Conclusion Powerpoint presentation files relevant for a Review of the poster contents:
4th Alpine Conference on SSNMR: Powerpoint review (Please NOTE: The files are of about 5 MB size and downloading from the site would take considerable time: Preferably opt to "save to disk" and then view)
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